Adjust data types to prevent load of invalid value

Adjust usacExtElementType data type to prevent load of invalid
value in extElementConfig().

Adjust usacConfigExtType data type to prevent load of invalid
value in configExtension().

Bug: 186706541
Test: atest android.media.cts.DecoderTestAacFormat android.media.cts.DecoderTestXheAac android.media.cts.DecoderTestAacDrc
Change-Id: Ide15daa73c084c4a2cfc9d0f36bd7666fa6bac7a
1 file changed