OMAP3: Add support for OMAP3 die ID

Read and store OMAP3 die ID in U-Boot environment.

Signed-off-by: Dirk Behme <dirk.behme@googlemail.com>
diff --git a/include/asm-arm/arch-omap3/omap3.h b/include/asm-arm/arch-omap3/omap3.h
index 02e36d7..8c9656f 100644
--- a/include/asm-arm/arch-omap3/omap3.h
+++ b/include/asm-arm/arch-omap3/omap3.h
@@ -43,6 +43,7 @@
  */
 #define OMAP34XX_CORE_L4_IO_BASE	0x48000000
 #define OMAP34XX_WAKEUP_L4_IO_BASE	0x48300000
+#define OMAP34XX_ID_L4_IO_BASE		0x4830A200
 #define OMAP34XX_L4_PER			0x49000000
 #define OMAP34XX_L4_IO_BASE		OMAP34XX_CORE_L4_IO_BASE