[PATCH][SRU][xenial] Support a new side button on Dell AIO

[Alex Hung]

Impact:
  Dell AIO has a side button to toggle display on & off, but it requires 
  dell-wmi to handle a new event from BIOS and to generate KEY_DISPLAYTOGGLE

Fix:
  This patch adds a new keycode KEY_DISPLAYTOGGLE to handle the BIOS event.

  The patches are included in upstream and are cherry-picked from Linus's repo.

Tested:
  The patches are tested on Dell Inspiron 24-3460

Regression Potential:
  Very low - the patch adds a new keycode only.

BugLink: http://bugs.launchpad.net/bugs/1702541

Alex Hung (1):
  dell-wmi: Add a WMI event code for display on/off

 drivers/platform/x86/dell-wmi.c | 3 +++
 1 file changed, 3 insertions(+)

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2.7.4