ARM: dts: msm: specify the LED GPIO configuration for mdmcalifornium MTP

GPIO 3 in PMDcalifornium is used to control the green LED
present on mdmcalifornium MTP. Specify the required
configuration for that GPIO. Keep it disabled by configuring
it in Hi-Z mode.

CRs-Fixed: 972331
Change-Id: Iffd8415fdd6df302dc9bdbd97e5718d4652528fb
Signed-off-by: Devesh Jhunjhunwala <deveshj@codeaurora.org>