mediav2: Remove H.263 from CDD required list

CDD doesn't require H.263 decoder for any of the device types
and hence it is now removed from that list.

Bug: 307481259
Bug: 308340390
Test: Remove h263 codecs from media_codecs_sw.xml and then
      atest CtsMediaV2TestCases

Merged-In: I068183478be87b5e7ac1246e69a963f773b9f146
Change-Id: I068183478be87b5e7ac1246e69a963f773b9f146
(cherry picked from commit 6dcf03c569beae8bab91418946f1a7c07c551d2e)