scsi: core: Fix invisible definition compilation warning

In 'include/ufs/ufshcd.h' file, 'enum dma_data_direction' will be used,
which is defined in linux/dma-direction.h, however, this header file is not
included in ufshcd.h, thus causing the following compilation warning:

"warning: ‘enum dma_data_direction’ declared inside parameter list will not
be visible outside of this definition or declaration"

Fix this warning by including 'linux/dma-direction.h'.

Fixes: 6ff265fc ("scsi: ufs: core: bsg: Add advanced RPMB support in ufs_bsg")
Reported-by: Xiaosen He <quic_xiaosenh@quicinc.com>
Reported-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Bean Huo <beanhuo@micron.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

include/ufs/ufshcd.h

@@ -17,6 +17,7 @@
 #include <linux/blk-mq.h>
 #include <linux/devfreq.h>
 #include <linux/pm_runtime.h>
+#include <linux/dma-direction.h>
 #include <scsi/scsi_device.h>
 #include <ufs/unipro.h>
 #include <ufs/ufs.h>