msm8960: adds dedicated platform dir for 8960

Plus other minor cleanup.
Plus RUMI3 support.

Change-Id: I558f69df66d121b3cd982ed4e09622559af19022
diff --git a/target/msm8960/rules.mk b/target/msm8960/rules.mk
index 0091d68..b63239c 100644
--- a/target/msm8960/rules.mk
+++ b/target/msm8960/rules.mk
@@ -2,7 +2,7 @@
 
 INCLUDES += -I$(LOCAL_DIR)/include -I$(LK_TOP_DIR)/platform/msm_shared
 
-PLATFORM := msm8x60
+PLATFORM := msm8960
 
 MEMBASE := 0x40100000 # SDRAM
 MEMSIZE := 0x00100000 # 1MB