ARM: dts: msm: add gpio_key device for VOL_UP button for trinket

Add pinctrl configurations for volume up button which utilize PM6125
GPIO 5.  Add gpio_key devices for this button on trinket IDP and QRD
targets.

Change-Id: Iebe1555b37d4ab751eb8335840b104628624637d
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>