FIXUP: CHROMIUM: drm/evdi: Use free platform device again after its parent was removed

0-day reports:

drivers/gpu/drm/evdi/evdi_drv.c:74:6: warning:
	no previous prototype for function 'evdi_platform_device_is_free'
bool evdi_platform_device_is_free(struct platform_device *pdev)

Also mark other locally used functions static.

BUG=chromium:923165, b:172225747
TEST=Compile

Change-Id: I317bac44ab394adf892a955f732e662a63de61bb
Disallow-Recycled-Builds: test-failures
Signed-off-by: Guenter Roeck <groeck@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/2709619
(cherry picked from commit fb302b820abee5c0679425552094d828dd13d67c)
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/3042831
Tested-by: Pablo Ceballos <pceballos@chromium.org>
Auto-Submit: Pablo Ceballos <pceballos@chromium.org>
Commit-Queue: Joe Tessler <jrt@chromium.org>
Reviewed-by: Joe Tessler <jrt@chromium.org>
2 files changed