Codec2CommonUtils: Reduce android_get_device_api_level() calls

Instead of calling android_get_device_api_level() for every frame,
it is now called once and stored in a static variable.

Bug: 246792159
Test: Decode 10-bit clip and confirm android_get_device_api_level() is
called only once.

Change-Id: I10402a3f729910e87fc74d48e0afa0830c7873ba