spi: offload: types: include linux/bits.h

Add #include <linux/bits.h> to linux/spi/offload/types.h since this
file uses the BIT macro.

Suggested-by: Andy Shevchenko <[e-mail]>
Signed-off-by: David Lechner <[e-mail]>
Reviewed-by: Andy Shevchenko <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

include/linux/spi/offload/types.h

···
 #ifndef __LINUX_SPI_OFFLOAD_TYPES_H
 #define __LINUX_SPI_OFFLOAD_TYPES_H
 
+#include <linux/bits.h>
 #include <linux/types.h>
 
 struct device;