platform: msm8952: Add GPLL4 clock overrides for 8956

Add functions to detect the platform as 8956, and
to update the status registers and bits to be checked
for GPLL4.

Change-Id: Ic2bbf727d30ab2f7c17461e0fc769d4fd7cbfac4
diff --git a/platform/msm8952/include/platform/iomap.h b/platform/msm8952/include/platform/iomap.h
index 6992522..8ea20f4 100644
--- a/platform/msm8952/include/platform/iomap.h
+++ b/platform/msm8952/include/platform/iomap.h
@@ -98,6 +98,7 @@
 #define APCS_GPLL_ENA_VOTE                 (CLK_CTL_BASE + 0x45000)
 #define APCS_CLOCK_BRANCH_ENA_VOTE         (CLK_CTL_BASE + 0x45004)
 #define GPLL4_MODE                         (CLK_CTL_BASE + 0x24000)
+#define GPLL4_STATUS                       (CLK_CTL_BASE + 0x24024)
 
 /* SDCC */
 #define SDC1_HDRV_PULL_CTL                 (TLMM_BASE_ADDR + 0x10A000)