ARM: dts: msm: Remove CPR register range from SDM670 GMU device node

Remove unused CPR register range from SDM670 GMU device node. This
range was added as part of a SW workaround for CPR HW bug which is
no longer needed after a better system wide workaround is already
in place.

Change-Id: I6d7d6baa87f7e4d90e3f5eec1a3c61bfc7b301be
Signed-off-by: Deepak Kumar <dkumar@codeaurora.org>