Update Security String to 2022-04-01 am: 8eac089eef am: c1c129c70e am: 0cc522cbae am: 19dac5cf1e

Original change: https://googleplex-android-review.googlesource.com/c/platform/build/+/16742829

Change-Id: I00823401a013a2c0b33e9998557e9889e677cdb0
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index a887a66..d370865 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -240,7 +240,7 @@
     #  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 := 2022-03-01
+      PLATFORM_SECURITY_PATCH := 2022-04-01
 endif
 .KATI_READONLY := PLATFORM_SECURITY_PATCH