target: project: msm8909: Add macro for PON register

Add macro enable usage of PON register for reboot reason, remove
shutdown_device api from target code and add pmic reset api for this
target

Change-Id: Ic629b7e105802bb4b2218b5721cbecc61dadd988
diff --git a/project/msm8909.mk b/project/msm8909.mk
index 64805e9..b7094e6 100644
--- a/project/msm8909.mk
+++ b/project/msm8909.mk
@@ -72,3 +72,5 @@
 
 #Enable the external reboot functions
 ENABLE_REBOOT_MODULE := 1
+#Use PON register for reboot reason
+DEFINES += USE_PON_REBOOT_REG=1