Ignore face down detector with shell command

- Shell command to ignore face down detector signals for testing

Bug: 329371579
Test: adb shell dumpsys power | grep mIsFaceDown -A1
Test: adb shell cmd power set-face-down-detector false
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:53ee705b9685926302dbf729f42ebbd0ad49666b)
Merged-In: I89970bda86e4624c4ef8e5c322cb03588ff719ad
Change-Id: I89970bda86e4624c4ef8e5c322cb03588ff719ad