regulator: dt-bindings: fan53555: add tcs,tcs4526

The driver has accepted tcs,tcs4526 since commit 5eee5eced9
("regulator: fan53555: add tcs4526"), which added the compatible to both
the of_device_id and i2c_device_id tables for the TCS4526, a chip that
reports id 0 rather than the TCS4525's id 12.

The binding was converted to DT schema afterwards, in commit 6cea468b68
("regulator: dt-bindings: Convert Fairchild FAN53555 to DT schema"), and
only picked up tcs,tcs4525. No in-tree DTS used the 4526 string at the
time, so nothing flagged the omission.

RK3399Pro boards use the TCS4526 for vdd_gpu and vdd_cpu_b, so a DTS
describing them fails dtbs_check today even though the driver binds
correctly.

Add the missing compatible.

Signed-off-by: Rudi Heitbaum <rudi@heitbaum.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://patch.msgid.link/aousEdwMni9ScZBn@0d3a7a881997
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/regulator/fcs,fan53555.yaml

@@ -23,6 +23,7 @@ properties:
           - silergy,syr827
           - silergy,syr828
           - tcs,tcs4525
+          - tcs,tcs4526
       - items:
           - const: rockchip,rk8601
           - const: rockchip,rk8600