MAINTAINERS: Adjust the file entry in SIEMENS IPC LED DRIVERS

Commit 835a0c10d33b ("leds: Rename simple directory to simatic") renames
the driver's directory to drivers/leds/simatic, but misses to adjust the
SIEMENS IPC LED DRIVERS section in MAINTAINERS.

Hence, ./scripts/get_maintainer.pl --self-test=patterns complains about a
broken reference. Adjust the file entry to this renaming.

Signed-off-by: Lukas Bulwahn <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Lee Jones <[e-mail]>

MAINTAINERS

···
 M:	Tobias Schaffner <[e-mail]>
 L:	[e-mail]
 S:	Maintained
-F:	drivers/leds/simple/
+F:	drivers/leds/simatic/
 
 SIEMENS IPC PLATFORM DRIVERS
 M:	Bao Cheng Su <[e-mail]>