libstagefright: Fallback to software encoder for high resolutions

Add error check conditions to fallback to software encoder if
q6 encoder fails in configure codec. Q6 encoder fails
for resolutions greater than FWVGA

CRs-Fixed: 511608

Change-Id: I4d765f45cd3b9c128260e7c96f139b671950d0ce
Merge "libstagefright: Fallback to software encoder for high resolutions" into jb4.3