ime: update patchlevel script

- Set patch level to 2019-04-01 to account for 1.68 Exodus OTA

Change-Id: If7e9dec5f826992db2b6ba9b781214cf128135d1

Author: freak07

BoardConfig.mk

@@ -115,7 +115,9 @@ PLATFORM_VERSION := 8.0.0
 # 1.57 OTA
 #PLATFORM_SECURITY_PATCH := 2019-01-01
 # 1.62 OTA
-PLATFORM_SECURITY_PATCH := 2019-02-01
+# PLATFORM_SECURITY_PATCH := 2019-02-01
+# 1.68 OTA
+PLATFORM_SECURITY_PATCH := 2019-04-01
 
 # Encryption
 TARGET_HW_DISK_ENCRYPTION := true