omap: Use spl_soc_init instead of spl_board_init

Both spl_board_init and spl_soc_init are available as ways to run
specific code in the SPL's board_init_r. Use the former for init
code that is specific to the SoC and leave spl_board_init available
for boards to use.

Signed-off-by: Paul Kocialkowski <paulk@sys-base.io>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index ba0359f..656f588 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -802,7 +802,7 @@
 	bool "TI OMAP2+"
 	select CPU_V7A
 	select GPIO_EXTRA_HEADER
-	select SPL_BOARD_INIT if SPL
+	select SPL_SOC_INIT if SPL
 	select SPL_STACK_R if SPL
 	select SUPPORT_SPL
 	imply TI_SYSC if DM && OF_CONTROL