Update platform security string to 2017-10-05 in oc-dev Bug:64896113
(cherry picked from commit 4e140ce86ac37b5a5aec06058262fe1a7a835909)

Change-Id: Ic0c579a7907f25df37c652be8f7a862db2c11d22
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index dcf6dd2..a44ce77 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -165,7 +165,7 @@
     #  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 := 2017-10-01
+      PLATFORM_SECURITY_PATCH := 2017-10-05
 endif
 
 ifndef PLATFORM_BASE_OS