arm: mediatek: add MT8183 kukui krane board support

Add support for the Lenovo IdeaPad Duet (google,krane sku176), an
MT8183 ChromeOS tablet from the kukui family. The board boots through
coreboot + depthcharge, which load U-Boot as an arm64 Image at an
arbitrary 2 MiB-aligned DRAM slot; keep CONFIG_POSITION_INDEPENDENT
like the pumpkin target.

The board shares the pumpkin's board file, renamed to mt8183.c since it
is generic for the SoC. The defconfig uses the upstream devicetree from
dts/upstream (CONFIG_OF_UPSTREAM) and drops the pumpkin-specific USB
gadget/fastboot support for now.

board/mediatek/mt8183/MAINTAINERS

@@ -4,3 +4,9 @@ S:	Maintained
 F:	board/mediatek/mt8183
 F:	include/configs/mt8183.h
 F:	configs/mt8183_pumpkin_defconfig
+
+MT8183 Kukui Krane (Lenovo IdeaPad Duet)
+M:	Weijie Gao <weijie.gao@mediatek.com>
+M:	Igor Belwon <igor.belwon@mentallysanemainliners.org>
+S:	Maintained
+F:	configs/mt8183_kukui_krane_defconfig

board/mediatek/mt8183/Makefile

@@ -1,3 +1,3 @@
 # SPDX-License-Identifier:	GPL-2.0
 
-obj-y += mt8183_pumpkin.o
+obj-y += mt8183.o

configs/mt8183_kukui_krane_defconfig

@@ -0,0 +1,76 @@
+CONFIG_ARM=y
+CONFIG_COUNTER_FREQUENCY=13000000
+CONFIG_POSITION_INDEPENDENT=y
+CONFIG_ARCH_MEDIATEK=y
+CONFIG_TEXT_BASE=0x4c000000
+CONFIG_SYS_MALLOC_F_LEN=0x4000
+CONFIG_NR_DRAM_BANKS=1
+CONFIG_ENV_SIZE=0x1000
+CONFIG_ENV_OFFSET=0x0
+CONFIG_DM_GPIO=y
+CONFIG_DEFAULT_DEVICE_TREE="mediatek/mt8183-kukui-krane-sku176"
+CONFIG_TARGET_MT8183=y
+CONFIG_SYS_LOAD_ADDR=0x4c000000
+CONFIG_DEBUG_UART_BASE=0x11002000
+CONFIG_OF_UPSTREAM=y
+CONFIG_DEBUG_UART_CLOCK=26000000
+# CONFIG_PSCI_RESET is not set
+CONFIG_DEBUG_UART=y
+# CONFIG_EFI_LOADER is not set
+# CONFIG_ANDROID_BOOT_IMAGE is not set
+CONFIG_FIT=y
+# CONFIG_ARCH_FIXUP_FDT_MEMORY is not set
+CONFIG_USE_BOOTCOMMAND=y
+CONFIG_BOOTCOMMAND="run distro_bootcmd"
+CONFIG_DEFAULT_FDT_FILE="mt8183-kukui-krane-sku176"
+CONFIG_SYS_CBSIZE=256
+CONFIG_SYS_PBSIZE=276
+# CONFIG_DISPLAY_BOARDINFO is not set
+CONFIG_HUSH_PARSER=y
+# CONFIG_CMD_BDI is not set
+# CONFIG_CMD_CONSOLE is not set
+# CONFIG_CMD_BOOTD is not set
+# CONFIG_CMD_BOOTI is not set
+# CONFIG_CMD_ELF is not set
+# CONFIG_CMD_GO is not set
+# CONFIG_CMD_IMI is not set
+CONFIG_BOOTDELAY=-1
+# CONFIG_CMD_XIMG is not set
+# CONFIG_CMD_EXPORTENV is not set
+# CONFIG_CMD_IMPORTENV is not set
+# CONFIG_CMD_EDITENV is not set
+# CONFIG_CMD_CRC32 is not set
+CONFIG_SYS_WHITE_ON_BLACK=y
+# CONFIG_CMD_MEMORY is not set
+CONFIG_CMD_CLK=y
+CONFIG_CMD_GPT=y
+# CONFIG_CMD_LOADB is not set
+# CONFIG_CMD_LOADS is not set
+CONFIG_CMD_MMC=y
+CONFIG_CMD_PART=y
+# CONFIG_CMD_ITEST is not set
+# CONFIG_CMD_SETEXPR is not set
+# CONFIG_CMD_BLOCK_CACHE is not set
+CONFIG_CMD_SYSBOOT=y
+CONFIG_CMD_EXT4=y
+CONFIG_CMD_FAT=y
+CONFIG_CMD_FS_GENERIC=y
+# CONFIG_DOS_PARTITION is not set
+CONFIG_ENV_IS_IN_MMC=y
+CONFIG_ENV_MMC_EMMC_HW_PARTITION=2
+CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG=y
+CONFIG_CLK=y
+CONFIG_VIDEO=y
+CONFIG_VIDEO_MT8183_SCANOUT=y
+# CONFIG_INPUT is not set
+# CONFIG_MMC_QUIRKS is not set
+CONFIG_MMC_MTK=y
+# CONFIG_POWER is not set
+CONFIG_BAUDRATE=921600
+CONFIG_DM_SERIAL=y
+CONFIG_DEBUG_UART_ANNOUNCE=y
+CONFIG_MTK_SERIAL=y
+CONFIG_WDT=y
+CONFIG_WDT_MTK=y
+# CONFIG_RANDOM_UUID is not set
+# CONFIG_REGEX is not set