radeon/vcn : Corrected dpb_size calculation for VP9_2

Currently dpb_size for VP9 profile0 and profile2 is same eventhough
for profile2 dpb_size is  multiplied by extra 3/2 and we are
seeing VM_L2_PROTECTION_FAULT error and ring vcn_dec timeout because
of less dpb_size for VP9_2.

This patch will correct dpb_size for VP9_2 and fixes the issue.

Signed-off-by: SureshGuttula <suresh.guttula@amd.com>
Reviewed-by: Leo Liu <leo.liu@amd.com>
Part-of: <!7480>
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