arm: rmobile: Use imply for BOARD_EARLY_INIT_F

Use "imply" instead of "select" for BOARD_EARLY_INIT_F config option,
and then disable it on boards which don't need it.

Updated grpeach_defconfig to disable CONFIG_BOARD_EARLY_INIT_F option for
RZA1.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 6a02278..abbc89a 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -943,9 +943,9 @@
 
 config ARCH_RMOBILE
 	bool "Renesas ARM SoCs"
-	select BOARD_EARLY_INIT_F if !RZA1
 	select DM
 	select DM_SERIAL
+	imply BOARD_EARLY_INIT_F
 	imply CMD_DM
 	imply FAT_WRITE
 	imply SYS_THUMB_BUILD
diff --git a/configs/grpeach_defconfig b/configs/grpeach_defconfig
index fb5a7b0..8b08b77 100644
--- a/configs/grpeach_defconfig
+++ b/configs/grpeach_defconfig
@@ -12,6 +12,7 @@
 CONFIG_BOOTDELAY=3
 CONFIG_USE_BOOTARGS=y
 CONFIG_BOOTARGS="ignore_loglevel"
+# CONFIG_BOARD_EARLY_INIT_F is not set
 # CONFIG_DISPLAY_CPUINFO is not set
 CONFIG_HUSH_PARSER=y
 # CONFIG_CMD_ELF is not set