ARM: 5627/1: Fix restoring of lr at the end of mcount

After ftrace_trace_function is called r1 is probably clobbered so don't
try to use its value for restoring.

This was introduced in v2.6.29~38^2~7
Signed-off-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

arch/arm/kernel/entry-common.S

@@ -148,7 +148,7 @@ trace:
 	sub r0, r0, #MCOUNT_INSN_SIZE
 	mov lr, pc
 	mov pc, r2
-	mov lr, r1				@ restore lr
+	ldr lr, [fp, #-4]			@ restore lr
 	ldmia sp!, {r0-r3, pc}
 
 #endif /* CONFIG_DYNAMIC_FTRACE */