Rename "bitrate-control" to "bitrate-modes"

The property name that is listed in xml files is
"bitrate-modes", not bit "bitrate-control".

Test: make cts -j123 && cts-tradefed run cts-dev -m \
CtsMediaTestCases --compatibility:module-arg \
CtsMediaTestCases:include-annotation:\
android.platform.test.annotations.RequiresDevice

Bug: 65769027
Change-Id: Ifef752e05cac3b868cee76ce69f1763c075f10ec