Make change and version bump to N2G48F

Change-Id: Id04d58f9095deec145974570e017d6a29763c338
diff --git a/core/build_id.mk b/core/build_id.mk
index 6f5a6ef..b00200f 100644
--- a/core/build_id.mk
+++ b/core/build_id.mk
@@ -18,4 +18,4 @@
 # (like "CRB01").  It must be a single word, and is
 # capitalized by convention.
 
-export BUILD_ID=N2G48E
+export BUILD_ID=N2G48F
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index 638983f..9ff3565 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -131,7 +131,7 @@
     #  It must be of the form "YYYY-MM-DD" on production devices.
     #  It must match one of the Android Security Patch Level strings of the Public Security Bulletins.
     #  If there is no $PLATFORM_SECURITY_PATCH set, keep it empty.
-    PLATFORM_SECURITY_PATCH := 2017-09-05
+    PLATFORM_SECURITY_PATCH := 2017-10-05
 endif
 
 ifeq "" "$(PLATFORM_BASE_OS)"