am33xx/omap4+: Move SRAM_SCRATCH_SPACE_ADDR to <asm/arch/omap.h>

The location of valid scratch space is dependent on SoC, so move that
there.  On OMAP4+ we continue to use SRAM_SCRATCH_SPACE_ADDR.  On
am33xx/ti814x we want to use what the ROM defines as "public stack"
which is the area after our defined download image space.  Correct the
comment about and location of CONFIG_SPL_TEXT_BASE.

Signed-off-by: Tom Rini <trini@ti.com>
diff --git a/arch/arm/include/asm/arch-am33xx/omap.h b/arch/arm/include/asm/arch-am33xx/omap.h
index db15159..e7576c1 100644
--- a/arch/arm/include/asm/arch-am33xx/omap.h
+++ b/arch/arm/include/asm/arch-am33xx/omap.h
@@ -31,8 +31,10 @@
 #ifdef CONFIG_AM33XX
 #define NON_SECURE_SRAM_START	0x402F0400
 #define NON_SECURE_SRAM_END	0x40310000
+#define SRAM_SCRATCH_SPACE_ADDR	0x4030C000
 #elif defined(CONFIG_TI814X)
 #define NON_SECURE_SRAM_START	0x40300000
 #define NON_SECURE_SRAM_END	0x40320000
+#define SRAM_SCRATCH_SPACE_ADDR	0x4031B800
 #endif
 #endif