Set PLATFORM_VERSION for PPR1 builds to P

Fixes error about missing PPR1.adb_key file.

Bug: 34972208
Test: lunch sailfish-userdebug-PPR1 && m -j
Change-Id: I82cd78376f3e238a6c4aaf27825c8d66b89d5a89
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index 2efff77..03629b2 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -97,10 +97,12 @@
 # please add that PLATFORM_VERSION to the following text file:
 # cts/tests/tests/os/assets/platform_versions.txt
 PLATFORM_VERSION.OPR1 := O
+PLATFORM_VERSION.PPR1 := P
 
 # This is the current development code-name, if the build is not a final
 # release build.  If this is a final release build, it is simply "REL".
 PLATFORM_VERSION_CODENAME.OPR1 := O
+PLATFORM_VERSION_CODENAME.PPR1 := P
 
 ifndef PLATFORM_VERSION
   PLATFORM_VERSION := $(PLATFORM_VERSION.$(TARGET_PLATFORM_VERSION))