msm: vidc: Fixed LTR count capability

Kona target supports two LTR frames encoding.
Fixing this capability in kona driver.
Handle resolution check correctly while setting
slice mode.

Change-Id: Iea6a041ecafb24da014832ecf2146088d4569a6f
CRs-Fixed: 2444064
Signed-off-by: Darshana Patil <darshana@codeaurora.org>