ufs: core: Rename ufs.c to ufs-uclass.c

Previous commit folded existing ufs-uclass.c into ufs.c ,
which produced a nice and reviewable change , but also broke
the UCLASS should be in *-uclass.c pattern. Fix it. Keep the
change separate from the previous one to make this reviewable.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Link: https://patch.msgid.link/20251028142335.18125-3-marek.vasut+renesas@mailbox.org
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>

drivers/ufs/Makefile

@@ -3,7 +3,7 @@
 # Copyright (C) 2019 Texas Instruments Incorporated - https://www.ti.com
 #
 
-obj-$(CONFIG_UFS) += ufs.o
+obj-$(CONFIG_UFS) += ufs-uclass.o
 obj-$(CONFIG_CADENCE_UFS) += cdns-platform.o
 obj-$(CONFIG_UFS_MEDIATEK) += ufs-mediatek.o
 obj-$(CONFIG_QCOM_UFS) += ufs-qcom.o