Increase max dimensions for mpeg4 decoder in media_codecs_sw.xml

MPEG4 decoder's limits are now increased to 1920x1920 instead
of 352x288 used so far.

Bug: 193000795
Test: clips in bug using files app
Test: atest CtsMediaV2TestCases

Change-Id: I11e47efe3d67187a3166b5d01035b7f57b751ec8
(cherry picked from commit f00c908e)
Merged-In:I11e47efe3d67187a3166b5d01035b7f57b751ec8