MAINTAINERS: update polarfire soc clock binding

The clock binding has been renamed and a new binding added for the
clock controllers in the FPGA fabric. Generalise the pattern to
cover both.

Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20221010221704.2161221-2-conor@kernel.org/


Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>