MAINTAINERS: Update Intel 8255 GPIO driver file list

The drivers/gpio/gpio-i8255.h header file is also maintained.

Signed-off-by: William Breathitt Gray <[email protected]>
Signed-off-by: Bartosz Golaszewski <[email protected]>

Author: William Breathitt Gray

MAINTAINERS

@@ -9907,6 +9907,7 @@ M:	William Breathitt Gray <[email protected]>
 L:	[email protected]
 S:	Maintained
 F:	drivers/gpio/gpio-i8255.c
+F:	drivers/gpio/gpio-i8255.h
 
 INTEL ASoC DRIVERS
 M:	Cezary Rojewski <[email protected]>