Kconfig: Adds SYS_TEXT_BASE config option for Keystone2

This patch makes SYS_TEXT_BASE a config option for Keystone2
so that it can be used to load u-boot at different addresses
on secure and non-secure Keystone2 devices.

Signed-off-by: Madan Srinivas <madans@ti.com>
Signed-off-by: Andrew F. Davis <afd@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Lokesh Vutla <lokeshvutla@ti.com>
diff --git a/Kconfig b/Kconfig
index bbf4784..1cf990d 100644
--- a/Kconfig
+++ b/Kconfig
@@ -286,7 +286,7 @@
 config SYS_TEXT_BASE
 	depends on ARC || X86 || ARCH_UNIPHIER || ARCH_ZYNQMP || \
 		(M68K && !TARGET_ASTRO_MCF5373L) || MICROBLAZE || MIPS || \
-		ARCH_ZYNQ
+		ARCH_ZYNQ || ARCH_KEYSTONE
 	depends on !EFI_APP
 	hex "Text Base"
 	help