ARM: dts: msm: correct gpu_gx_gdsc syscon node names

Update the names for gpu_gx_gdsc syscon nodes so that they do not
include "0x" before the address.

Change-Id: I25463b2a4054238b4001af0165b844fbc007e65a
Signed-off-by: David Collins <collinsd@codeaurora.org>