dt-bindings: hwmon: move ibm,p8-occ bindings to proper folder

It accidently ended up in i2c, but it should be in the hwmon folder.

Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220615211619.6742-1-wsa@kernel.org