TI: ARCH_OMAP2PLUS: Enable SPL_STACK_R and provide default value

On ARCH_OMAP2PLUS platforms we know what the DDR layout is going to be,
and that it is safe to use SPL_STACK_R and provide a default value for
it.  select this and re-sync the defconfigs.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/common/spl/Kconfig b/common/spl/Kconfig
index b05ec21..0bd8370 100644
--- a/common/spl/Kconfig
+++ b/common/spl/Kconfig
@@ -94,6 +94,7 @@
 config SPL_STACK_R_ADDR
 	depends on SPL_STACK_R
 	hex "SDRAM location for SPL stack"
+	default 0x82000000 if ARCH_OMAP2PLUS
 	help
 	  Specify the address in SDRAM for the SPL stack. This will be set up
 	  before board_init_r() is called.