[ARM] remove pc_pointer()

pc_pointer() was a function to mask the PC for 26-bit ARMs, which
we no longer support.  Remove it.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index a2e7542..2ce9a40 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -385,7 +385,7 @@
 	do {
 		if (fp < stack_start || fp > stack_end)
 			return 0;
-		lr = pc_pointer (((unsigned long *)fp)[-1]);
+		lr = ((unsigned long *)fp)[-1];
 		if (!in_sched_functions(lr))
 			return lr;
 		fp = *(unsigned long *) (fp - 12);