arm: mvebu: Add select on ARCH_EARLY_INIT_R if ARM64

We need to be calling arch_early_init_r() on 64bit mvebu platforms, so
move this to a select.

Cc: Stefan Roese <sr@denx.de>
Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index bd7fffc..724cbdd 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -588,6 +588,7 @@
 
 config ARCH_MVEBU
 	bool "Marvell MVEBU family (Armada XP/375/38x/3700/7K/8K)"
+	select ARCH_EARLY_INIT_R if ARM64
 	select DM
 	select DM_SERIAL
 	select DM_SPI