arm/dt: msm-pm8841: Correct PM8841 SMPS 7 subnode addresses

The reg values specified for the subnodes of SMPS 7 do not match
the subnode addresses.  Update the reg values for these subnodes.

Change-Id: Ia264616f22dddf89822f9290a3dba593f6424cc8
Signed-off-by: David Collins <collinsd@codeaurora.org>