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/include/configs/igep0033.h b/include/configs/igep0033.h
index afbd549..12f28f8 100644
--- a/include/configs/igep0033.h
+++ b/include/configs/igep0033.h
@@ -215,12 +215,11 @@
 #define CONFIG_SPL
 #define CONFIG_SPL_FRAMEWORK
 /*
- * Place the image at the start of the ROM defined image space and leave
- * space for SRAM scratch entries (see arch/arm/include/omap_common.h).
+ * Place the image at the start of the ROM defined image space.
  * We limit our size to the ROM-defined downloaded image area, and use the
  * rest of the space for stack.
  */
-#define CONFIG_SPL_TEXT_BASE		0x402F0500
+#define CONFIG_SPL_TEXT_BASE		0x402F0400
 #define CONFIG_SPL_MAX_SIZE		(0x4030C000 - CONFIG_SPL_TEXT_BASE)
 #define CONFIG_SPL_STACK		CONFIG_SYS_INIT_SP_ADDR