Revert "Utils: add lower bound checks for MediaFormat keys"

This reverts commit 10f165c2d036f94348f9aa6c5e049eacbb131180.

Reason for revert: Breaks CTS (b/203988744)
Bug: 203988744
Bug: 146923138

Change-Id: Ifbe5a2eb16647bf4531b3c663be9559a248dd696
1 file changed