msm: vidc: Fix validate_pkt_size macro definition

[1] Convert validate_pkt_size macro to an inline
function as the macro definition always returns true.
[2] Handle return error code from hfi_fill_codec_info.

Change-Id: I9e7eadfe82c041721565c880eca3a46e4e3e98d9
Signed-off-by: Priyanka Gujjula <pgujjula@codeaurora.org>