msm: vidc: Fix resolution checks in work mode and route

New helper functions to check resolution. Also, set
low latency only for Encoder.

CRs-Fixed: 2384822
Change-Id: Ib8fdcf7adcbca8ebfa9ca2ecd11351b4adb55f4b
Signed-off-by: Chinmay Sawarkar <chinmays@codeaurora.org>