MAINTAINERS: adjust entry to tcan4x5x file split

Commit 7813887e ("can: tcan4x5x: rename tcan4x5x.c -> tcan4x5x-core.c") and
commit 67def4ef ("can: tcan4x5x: move regmap code into seperate file")
split the file tcan4x5x.c into two files, but missed to adjust the TI TCAN4X5X
DEVICE DRIVER section in MAINTAINERS.

Hence, ./scripts/get_maintainer.pl --self-test=patterns complains:

  warning: no file matches    F:    drivers/net/can/m_can/tcan4x5x.c

Adjust the file entry in MAINTAINERS to the tcan4x5x file splitting.
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Fixes: 67def4ef ("can: tcan4x5x: move regmap code into seperate file")
Fixes: 7813887e ("can: tcan4x5x: rename tcan4x5x.c -> tcan4x5x-core.c")
Link: https://lore.kernel.org/r/20210108073932.20804-1-lukas.bulwahn@gmail.comSigned-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

MAINTAINERS

@@ -17839,7 +17839,7 @@ M:	Dan Murphy <dmurphy@ti.com>
 L:	linux-can@vger.kernel.org
 S:	Maintained
 F:	Documentation/devicetree/bindings/net/can/tcan4x5x.txt
-F:	drivers/net/can/m_can/tcan4x5x.c
+F:	drivers/net/can/m_can/tcan4x5x*
 
 TI TRF7970A NFC DRIVER
 M:	Mark Greer <mgreer@animalcreek.com>