target/platform: MSM8952 Bringup changes.

This patch adds support for -
1. Correct the USB freq plan.
2. Change the Volume up key GPIO status from Active high to low.
3. Update the mmu mapping for the scratch region

Change-Id: I45b5ea05e7cd70a52ded49c81d2cd1fd3f0ad6d6
diff --git a/target/msm8952/init.c b/target/msm8952/init.c
index 445e132..2e743c2 100644
--- a/target/msm8952/init.c
+++ b/target/msm8952/init.c
@@ -161,7 +161,7 @@
 	status = gpio_status(TLMM_VOL_UP_BTN_GPIO);
 
 	/* Active high signal. */
-	return status;
+	return !status;
 }
 
 /* Return 1 if vol_down pressed */