C2SoftHevcEnc: Increase supported resolution to 960x544

CDD requires support for level 3 for HEVC encoding
Level 3 requires 960x540 encoding

Bug: 152576008
Bug: 158718124
Test: atest android.media.cts.VideoEncoderTest
Test: atest android.mediav2.cts.EncoderProfileLevelTest

Change-Id: Idba7b14d5f4d16bc3b474fba582e3cf14ecc50de