MAINTAINERS: Add myself as reviewer for PWM rust drivers

I would like to help with reviewing the Rust part of the PWM drivers.
While I maintain the Rust bindings, adding this separate entry ensures I
am automatically CC-ed on the driver implementations (drivers/pwm/*.rs)

Signed-off-by: Michal Wilczynski <m.wilczynski@samsung.com>
Link: https://patch.msgid.link/20260119-maintain_rust_drivers-v1-1-88711afc559e@samsung.com
Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>

Author: Michal Wilczynski

MAINTAINERS

@@ -21089,6 +21089,10 @@ S:	Maintained
 F:	rust/helpers/pwm.c
 F:	rust/kernel/pwm.rs
 
+PWM SUBSYSTEM DRIVERS [RUST]
+R:	Michal Wilczynski <m.wilczynski@samsung.com>
+F:	drivers/pwm/*.rs
+
 PXA GPIO DRIVER
 M:	Robert Jarzmik <robert.jarzmik@free.fr>
 L:	linux-gpio@vger.kernel.org