platform: msm8996: set hdmi pll as external pixel clock source

Set hdmi pll as the source of the external pixel clock so that
it is driven at the correct rate, according to pll calculations
done for hdmi.

Change-Id: Ic316292aa5e194f4c7971f8dfd563f425027476b
diff --git a/platform/msm8996/msm8996-clock.c b/platform/msm8996/msm8996-clock.c
index 5856210..4703d84 100644
--- a/platform/msm8996/msm8996-clock.c
+++ b/platform/msm8996/msm8996-clock.c
@@ -46,7 +46,7 @@
 #define mmpll1_mm_source_val 2
 #define mmpll3_mm_source_val 3
 #define gpll0_mm_source_val 5
-#define hdmipll_mm_source_val 3
+#define hdmipll_mm_source_val 1
 
 struct clk_freq_tbl rcg_dummy_freq = F_END;