Merge tag 'libdrm-2.4.97' into aosp-merge-libdrm-2.4.97

Merges libdrm-2.4.97 into aosp/master

Change-Id: I0c6447a4f05491632f568e7a247bd67eff5659dc
Signed-off-by: John Stultz <john.stultz@linaro.org>