vidc_3x: Change default resolution in video driver

In component init, omx sets qcif resolution on capture port
and driver has default 1080p resolution on output port.
Maximum mbs_per_frame of both ports is considered in load
calculation. This causes overload error even if omx sets qcif
in component init which is not valid. So default
resolution in driver is changed to qcif.

Change-Id: I47dd9713b54e3fc67bc6bd531b963d02407285f8
Signed-off-by: Vasantha Balla <vballa@codeaurora.org>