Remove execute bit from non-executable files.

This is almost certainly a mistake in all cases, and any files that are
text-based have been spot checked to make sure they don't contain a
shebang or have any other indications of intentionally being executable.

Commands run:
    fdfind -t x -e java -x chmod -x
    fdfind -t x -e kt -x chmod -x
    fdfind -t x -e ogg -x chmod -x
    fdfind -t x -e xml -x chmod -x
    fdfind -t x -e aidl -x chmod -x
    fdfind -t x -e html -x chmod -x
    fdfind -t x -e png -x chmod -x

Bug: 345485143
Test: N/A
Flag: Exempt, mechanical change
Change-Id: I2902380611eb51d0c0e18f2f31e41f37163bd922