ARM: dts: imx: Remove 'compatible' from the pfuze nodes

Passing the 'compatible' property inside the pfuze100 regulator nodes
is not allowed per pfuze100.yaml and results in the following
warning:

imx6q-bosch-acc.dtb: pmic@8: regulators:sw3a: Unevaluated properties are not allowed ('compatible' was unexpected)

Remove it.

Signed-off-by: Fabio Estevam <festevam@denx.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>