platform: add MDP interface 2 base address

Add base address for MDP interface 2 (DSI1) which is required to support
display panel using DSI1 alone.

Change-Id: Iacf5167b6e109b78a29de637a7b75ccada37273f
diff --git a/platform/msm8994/include/platform/iomap.h b/platform/msm8994/include/platform/iomap.h
index 2427869..4419306 100644
--- a/platform/msm8994/include/platform/iomap.h
+++ b/platform/msm8994/include/platform/iomap.h
@@ -267,6 +267,7 @@
 
 #define MDP_INTF_0_TIMING_ENGINE_EN             REG_MDP(0x6b000)
 #define MDP_INTF_1_TIMING_ENGINE_EN             REG_MDP(0x6b800)
+#define MDP_INTF_2_TIMING_ENGINE_EN             REG_MDP(0x6C000)
 
 #define MDP_CTL_0_BASE              		REG_MDP(0x2000)
 #define MDP_CTL_1_BASE              		REG_MDP(0x2200)