Add vendor prefix to slpi property

For devices launching with Android Q or later, properties defined by
vendor should have the prefix "vendor."

Bug: 138278883
Test: m
Change-Id: I85b56b50139b9366dbaa395bdf1f734b8eabfe55
diff --git a/init.qcom.devstart.sh b/init.qcom.devstart.sh
index 7409d7d..96e0ed2 100644
--- a/init.qcom.devstart.sh
+++ b/init.qcom.devstart.sh
@@ -10,4 +10,4 @@
 version=`grep -ao "OEM_IMAGE_VERSION_STRING[ -~]*" \
               /vendor/firmware/slpi.b04 | \
          sed -e s/OEM_IMAGE_VERSION_STRING=SLPI.version.// -e s/\(.*\).//`
-setprop sys.slpi.firmware.version "$version"
+setprop vendor.sys.slpi.firmware.version "$version"