hikey960: Drop unnecessary BOARD_EARLY_INIT_F usage

This platform enables CONFIG_BOARD_EARLY_INIT_F and then has a
do-nothing board_early_init_f function. Change to not enabling the
option and so not needing an empty function.

Signed-off-by: Tom Rini <trini@konsulko.com>

board/hisilicon/hikey960/hikey960.c

@@ -60,11 +60,6 @@ static struct mm_region hikey_mem_map[] = {
 
 struct mm_region *mem_map = hikey_mem_map;
 
-int board_early_init_f(void)
-{
-	return 0;
-}
-
 int misc_init_r(void)
 {
 	return 0;

configs/hikey960_defconfig

@@ -19,7 +19,6 @@ CONFIG_SYS_CBSIZE=256
 CONFIG_SYS_PBSIZE=283
 # CONFIG_DISPLAY_CPUINFO is not set
 # CONFIG_DISPLAY_BOARDINFO is not set
-CONFIG_BOARD_EARLY_INIT_F=y
 CONFIG_MISC_INIT_R=y
 CONFIG_SYS_PROMPT="U-Boot => "
 CONFIG_CMD_MD5SUM=y