arm/dt: Rename PM8026 files to PM8226 to reflect change in product name

The PM8026 device name is being changed to PM8226.  The dtsi file is
being renamed to reflect this change.

Change-Id: I0cda54fc752074c8e6af56a82623ab33b8e8996c
Signed-off-by: Kenneth Heitke <kheitke@codeaurora.org>
2 files changed