MAINTAINERS: Update PWM subsystem entry
MAINTAINERS: Update PWM subsystem entry

Change email to my private address and use the brand new linux-pwm
instead of the generic linux-kernel mailing list.

Signed-off-by: Thierry Reding <b75a4d02013b0e68ae2c6bb0dcfd4b7bec282dc9@gmail.com>

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