MAINTAINERS: invert Misc RISC-V SoC Support's pattern

There are now more directories that someone else maintains than ones I
do, so invert the pattern to cover included, rather than included
directories. Ditto for the bindings directory - there's more files there
that are the responsibility of others than mine (and I get CCed on all
bindings anyway). Remove it from the entry.

Signed-off-by: Conor Dooley <conor.dooley@microchip.com>