MAINTAINERS: Update Intel pin control to Supported

The actual status of the code is Supported.

Reported-by: [e-mail]
Signed-off-by: Andy Shevchenko <[e-mail]>
Acked-by: Mika Westerberg <[e-mail]>

MAINTAINERS

···
 PIN CONTROLLER - INTEL
 M:	Mika Westerberg <[e-mail]>
 M:	Andy Shevchenko <[e-mail]>
-S:	Maintained
+S:	Supported
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/pinctrl/intel.git
 F:	drivers/pinctrl/intel/