can: tcan4x5x: remove duplicate include of regmap.h

linux/regmap.h has been included at line 13, so remove the duplicate
one at line 14.

Fixes: 67def4ef ("can: tcan4x5x: move regmap code into seperate file")
Link: https://lore.kernel.org/r/20210323021026.140460-1-wanjiabing@vivo.comSigned-off-by: NWan Jiabing <wanjiabing@vivo.com>
Signed-off-by: NMarc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/m_can/tcan4x5x.h

@@ -11,7 +11,6 @@
 
 #include <linux/gpio/consumer.h>
 #include <linux/regmap.h>
-#include <linux/regmap.h>
 #include <linux/regulator/consumer.h>
 #include <linux/spi/spi.h>