ARM: dts: msm: update boot on regulator property for avdd

Enable the boot on property for avdd panel supply so that
kernel will retain the regulator state from uefi during bootup.

Change-Id: I5ef55d0d36119db9e3ff57721a2a551d4d9272d0
Signed-off-by: Vara Reddy <varar@codeaurora.org>