Merge from http://go/wvgerrit/29800
Add QUERY_KEY_CURRENT_SRM_VERSION and
QUERY_KEY_SRM_UPDATE_SUPPORT.
Test: run unit test
adb push $OUT/marlin/data/bin/libwvdrmdrmplugin_hidl_test
/vendor/bin/.
adb shell LD_LIBRARY_PATH="/vendor/lib/mediadrm" \
/vendor/bin/libwvdrmdrmplugin_hidl_test
bug: 63390310
Change-Id: Ie51056d22178565bd7b987aa901f7b7616d29328