v4l2: remove all decoder/encoder not supported

Actually HAL register support of VP8/VP9 and some secure codec but we
don't support it actually.

Remove declaration of decoder/encoder for unsupported codec and remove
all variable and check link to this codec.

Fix VTS test :
VtsHalMediaC2V1_0TargetMasterTest/PerInstance/Codec2MasterHalTest#ListComponents/0_default
VtsHalMediaC2V1_0TargetMasterTest/PerInstance/Codec2MasterHalTest#ListComponents/1_software
VtsHalMediaC2V1_0TargetComponentTest

Signed-off-by: Guillaume La Roque <glaroque@baylibre.com>