project: msm8952: Turn on Werror and Long press power on flags.

Turn on Werror to ensure compilation without warnings.
Also enable long press power on feature.

Change-Id: Ie2a46f811658d449ca4bfd0bd62f4de1be5e7eaf
diff --git a/project/msm8952.mk b/project/msm8952.mk
index b53fc36..b20e243 100644
--- a/project/msm8952.mk
+++ b/project/msm8952.mk
@@ -30,7 +30,7 @@
 DEFINES += BAM_V170=1
 
 #Enable the feature of long press power on
-#DEFINES += LONG_PRESS_POWER_ON=1
+DEFINES += LONG_PRESS_POWER_ON=1
 
 #Disable thumb mode
 ENABLE_THUMB := false
@@ -58,3 +58,5 @@
 
 #SCM call before entering DLOAD mode
 DEFINES += PLATFORM_USE_SCM_DLOAD=1
+
+CFLAGS += -Werror