ARM: dts: msm: update gpio setting for adv bridge chip

On msm8937 PMIC gpio number 8 is used to enable power
supply to ADV7533 bridge chip. Update the same in msm8937
CDP dt file.

Signed-off-by: Sandeep Panda <spanda@codeaurora.org>
Change-Id: Ifc4a2f140a7bebd50aff894ef46a32ed91596b74