Upgrade Cuttlefish GSI's PRODUCT_SHIPPING_API_LEVEL

Property access rule is stricter starting from Android P.

Bug: 120646021
Test: $ lunch aosp_cf_x86_gsi-userdebug
      $ launch_cvd
      # boot to home screen and both WLAN and LTE data work

Change-Id: Ibf6f27567296b1d05d3098232818ee5ae69d4a2d
diff --git a/shared/gsi/device.mk b/shared/gsi/device.mk
index a25ab83..d70b233 100644
--- a/shared/gsi/device.mk
+++ b/shared/gsi/device.mk
@@ -21,7 +21,7 @@
 
 # use include below so PRODUCT_SHIPPING_API_LEVEL can be overriden
 include device/google/cuttlefish/shared/device.mk
-PRODUCT_SHIPPING_API_LEVEL := 27
+PRODUCT_SHIPPING_API_LEVEL := 28
 
 TARGET_BUILD_SYSTEM_ROOT_IMAGE ?= true
 
@@ -29,7 +29,7 @@
 
 PRODUCT_PROPERTY_OVERRIDES += \
     keyguard.no_require_sim=true \
-    rild.libpath=libvsoc-ril.so \
+    vendor.rild.libpath=libvsoc-ril.so \
     ro.cdma.home.operator.alpha=Android \
     ro.cdma.home.operator.numeric=302780 \
     ro.gsm.home.operator.alpha=Android \
diff --git a/shared/sepolicy/property_contexts b/shared/sepolicy/property_contexts
index 8211175..ad97577 100644
--- a/shared/sepolicy/property_contexts
+++ b/shared/sepolicy/property_contexts
@@ -1,2 +1,3 @@
 vendor.ser.  u:object_r:vendor_ser_prop:s0
 sys.cf.ser.  u:object_r:sys_cf_ser_prop:s0
+vendor.ser.  u:object_r:vendor_ser_prop:s0