FROMLIST: input: Add KEY_CAMERA_FOCUS event in HID

Our HID device need KEY_CAMERA_FOCUS event to control camera, but this
event is non-existent in current HID driver.
So we add this event in hid-input.c

Bug: 263846073
Link: https://lore.kernel.org/linux-input/Y+4YcnbPwWAnhrPt@kroah.com/


Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: fengqi <fengqi@xiaomi.com>
Change-Id: I500881ea8b6b4e31099f2120e2c492f2793bf086