Fix initial buffer format for SoftVPX

Bug: 80553101

Test: playback VP9 profile 0 and profile 2 content with SoftVPX,
with verbose ACodec log, buffer shouldn't reallocate with profile0.
Check thumbnail generation in Photos work properly.

Change-Id: Ic488b110abee20b42f1877b23e763988dd8243b2
1 file changed