MAINTAINERS: return arch/sh to maintained state, with new maintainers

MAINTAINERS: return arch/sh to maintained state, with new maintainers

Add Yoshinori Sato and Rich Felker as maintainers for arch/sh
(SUPERH).

Signed-off-by: Rich Felker <[email protected]>
Signed-off-by: Yoshinori Sato <[email protected]>
Acked-by: D. Jeff Dionne <[email protected]>
Acked-by: Rob Landley <[email protected]>
Acked-by: Peter Zijlstra (Intel) <[email protected]>
Acked-by: Simon Horman <[email protected]>
Acked-by: Geert Uytterhoeven <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>