integratorap: make the compile work again

The integratorap/cp config for u-boot was outdated and would not
even compile, so fix the obvious missing bits for it to start
building. After this "make ap920t_config/make all" starts working
again.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/board/armltd/integrator/lowlevel_init.S b/board/armltd/integrator/lowlevel_init.S
index ab9589c..6f55bb5 100644
--- a/board/armltd/integrator/lowlevel_init.S
+++ b/board/armltd/integrator/lowlevel_init.S
@@ -199,7 +199,7 @@
 
 	/* Now 0x00000000 is writeable, replace the vectors	*/
 	ldr	r0, =_start	/* r0 <- start of vectors	*/
-	ldr	r2, =_armboot_start	/* r2 <- past vectors	*/
+	ldr	r2, =_TEXT_BASE	/* r2 <- past vectors	*/
 	sub	r1,r1,r1		/* destination 0x00000000	*/
 
 copy_vec: