Rename CONFIG_SYS_TEXT_BASE to CONFIG_TEXT_BASE

The current name is inconsistent with SPL which uses CONFIG_SPL_TEXT_BASE
and this makes it imposible to use CONFIG_VAL().

Rename it to resolve this problem.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/lib/crt0.S b/arch/arm/lib/crt0.S
index fe6b447..6d566dc 100644
--- a/arch/arm/lib/crt0.S
+++ b/arch/arm/lib/crt0.S
@@ -144,7 +144,7 @@
 	adr	r0, _main
 	ldr	r1, _start_ofs
 	add	r0, r1
-	ldr	r1, =CONFIG_SYS_TEXT_BASE
+	ldr	r1, =CONFIG_TEXT_BASE
 	sub	r1, r0
 	add	lr, r1
 #endif