Add ALL_INCLUDING_DISPLAYS category for getDisplays()

Add a category for DisplayManager#getDisplays() that includes
disabled/inaccessible/temporary displays in the set of returned
Displays.

Bug: 221071695
Test: adb shell cmd display get-displays \
      android.hardware.display.category.ALL_INCLUDING_DISABLED
Change-Id: If06f7f8b7f9ba4779a19d24d76fb49e95a908afc