platform: msm_shared: Replace ferrum with msm8909

Replace all the occurences of Ferrum with MSM8909,
which is the official name.

Change-Id: I7c2c3d439cc561a659a92c39472a879829be9d89
diff --git a/platform/msm_shared/rules.mk b/platform/msm_shared/rules.mk
index ff1516a..3ea14bb 100755
--- a/platform/msm_shared/rules.mk
+++ b/platform/msm_shared/rules.mk
@@ -448,7 +448,7 @@
 			$(LOCAL_DIR)/mipi_dsi_autopll_20nm.o
 endif
 
-ifeq ($(PLATFORM),ferrum)
+ifeq ($(PLATFORM),msm8909)
 	OBJS += $(LOCAL_DIR)/qgic.o \
 			$(LOCAL_DIR)/qtimer.o \
 			$(LOCAL_DIR)/qtimer_mmap.o \