ARM: mach-omap2: Kconfig: Allow OMAP5 devices to set entry point

Like AM33xx and AM43xx, DRA7xx and AM57xx devices may need to
have an non-standard boot address in memory. This may be due
to the device being a high security variant, which place the
Initial SoftWare (ISW) after certificates and secure software.

Allow these devices to set this from Kconfig.

Signed-off-by: Andrew F. Davis <afd@ti.com>
diff --git a/include/configs/ti_omap5_common.h b/include/configs/ti_omap5_common.h
index 8bf4a6b..ba57c40 100644
--- a/include/configs/ti_omap5_common.h
+++ b/include/configs/ti_omap5_common.h
@@ -81,7 +81,7 @@
  * RAM from address 0x40301350 (0x40300000+0x1000(reserved)+0x350(cert)).
  */
 #define TI_OMAP5_SECURE_BOOT_RESV_SRAM_SZ	0x1000
-#define CONFIG_SPL_TEXT_BASE	0x40301350
+#define CONFIG_SPL_TEXT_BASE	CONFIG_ISW_ENTRY_ADDR
 /* If no specific start address is specified then the secure EMIF
  * region will be placed at the end of the DDR space. In order to prevent
  * the main u-boot relocation from clobbering that memory and causing a