MAINTAINERS: Update MFD repo location
MAINTAINERS: Update MFD repo location

The old one hasn't been used for well over 6 months.

Signed-off-by: Lee Jones <630e34333487a351a857f6b705e04d30b37c1629@linaro.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs