sm8450-common: Add prebuilt protobuf 3.9.1 to vendor partition.

Needed to work around a Qualcomm HAL prebuilt.

Bug: 203713560
Bug: 258322017
Bug: 254854421
Test: Forrest
Change-Id: I4eebc60f10fbea6a66127ed3e08441db32536f78

common.mk

@@ -355,6 +355,10 @@ PRODUCT_COPY_FILES += \
 PRODUCT_PACKAGES += \
     libgrpc++_unsecure.vendor
 
+# Protobuf
+PRODUCT_PACKAGES += \
+    libprotobuf-cpp-full-3.9.1-vendorcompat
+
 # QTI
 PRODUCT_PACKAGES += \
     libqti_vndfwk_detect.vendor \