Set odm and vendor build.version.incremental to be publicly readable

VTS and CTS-on-GSI report the device's ro.odm.build.version.incremental
or ro.vendor.build.version.incremental. The properties need to be
readable without root privilege.

Test: adb shell getprop ro.odm.build.version.incremental
Bug: 145255132
Change-Id: Ibb71185888cce022cb3a9be3e6fb2199d5f438d9
diff --git a/public/property_contexts b/public/property_contexts
index 2951d33..b4890f8 100644
--- a/public/property_contexts
+++ b/public/property_contexts
@@ -365,6 +365,7 @@
 ro.odm.build.date u:object_r:exported_default_prop:s0 exact string
 ro.odm.build.date.utc u:object_r:exported_default_prop:s0 exact int
 ro.odm.build.fingerprint u:object_r:exported_default_prop:s0 exact string
+ro.odm.build.version.incremental u:object_r:exported_default_prop:s0 exact string
 ro.oem.key1 u:object_r:exported_default_prop:s0 exact string
 ro.product.board u:object_r:exported_default_prop:s0 exact string
 ro.product.cpu.abilist32 u:object_r:exported_default_prop:s0 exact string
@@ -384,6 +385,7 @@
 ro.vendor.build.date u:object_r:exported_default_prop:s0 exact string
 ro.vendor.build.date.utc u:object_r:exported_default_prop:s0 exact int
 ro.vendor.build.fingerprint u:object_r:exported_default_prop:s0 exact string
+ro.vendor.build.version.incremental u:object_r:exported_default_prop:s0 exact string
 ro.vndk.lite u:object_r:exported_default_prop:s0 exact bool
 ro.vndk.version u:object_r:exported_default_prop:s0 exact string
 ro.vts.coverage u:object_r:exported_default_prop:s0 exact int