arm: Rework usage of CONFIG_ARMV[78]_SECURE_BASE in linker scripts

In order to avoid defining CONFIG_ARMV[78_]SECURE_BASE as empty in the
linker scripts, if not already defined, add and use
__ARMV[78_]SECURE_BASE for when the base is not defined and we want the
linker scripts to continue.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/cpu/u-boot.lds b/arch/arm/cpu/u-boot.lds
index f25f72b..fc4f63d 100644
--- a/arch/arm/cpu/u-boot.lds
+++ b/arch/arm/cpu/u-boot.lds
@@ -77,11 +77,13 @@
 	}
 
 #ifndef CONFIG_ARMV7_SECURE_BASE
-#define CONFIG_ARMV7_SECURE_BASE
+#define __ARMV7_SECURE_BASE
 #define __ARMV7_PSCI_STACK_IN_RAM
+#else
+#define __ARMV7_SECURE_BASE	CONFIG_ARMV7_SECURE_BASE
 #endif
 
-	.secure_text CONFIG_ARMV7_SECURE_BASE :
+	.secure_text __ARMV7_SECURE_BASE :
 		AT(ADDR(.__secure_start) + SIZEOF(.__secure_start))
 	{
 		*(._secure.text)