MAINTAINERS: change sis_i2c maintainer email address

Signed-off-by: NMika Penttilä <mpenttil@redhat.com>
Link: https://lore.kernel.org/r/20221020061948.10221-1-mpenttil@redhat.comSigned-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

MAINTAINERS

@@ -18893,7 +18893,7 @@ F:	drivers/video/fbdev/sis/
 F:	include/video/sisfb.h
 
 SIS I2C TOUCHSCREEN DRIVER
-M:	Mika Penttilä <mika.penttila@nextfour.com>
+M:	Mika Penttilä <mpenttil@redhat.com>
 L:	linux-input@vger.kernel.org
 S:	Maintained
 F:	Documentation/devicetree/bindings/input/touchscreen/sis_i2c.txt