Clean up more warnings in lk code

Change-Id: I71eb3f1730ae0c80ec4d0da12a5b5755bc9f5614
diff --git a/platform/msm_shared/proc_comm.c b/platform/msm_shared/proc_comm.c
index be220c0..b7e7844 100644
--- a/platform/msm_shared/proc_comm.c
+++ b/platform/msm_shared/proc_comm.c
@@ -30,6 +30,7 @@
 
 #include <debug.h>
 #include <reg.h>
+#include <dev/gpio.h>
 
 #include <platform/iomap.h>
 #define ACPU_CLK           0  /* Applications processor clock */