scsi: ufs: core: Add UFS_HS_G6 and UFS_HS_GEAR_MAX to enum ufs_hs_gear_tag

scsi: ufs: core: Add UFS_HS_G6 and UFS_HS_GEAR_MAX to enum ufs_hs_gear_tag

Add UFS_HS_G6 to enum ufs_hs_gear_tag. In addition, add UFS_HS_GEAR_MAX to
enum ufs_hs_gear_tag to facilitate iteration over valid High Speed Gears.

Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Bean Huo <beanhuo@micron.com>
Signed-off-by: Can Guo <can.guo@oss.qualcomm.com>
Reviewed-by: Peter Wang <peter.wang@mediatek.com>
Link: https://patch.msgid.link/20260325152154.1604082-4-can.guo@oss.qualcomm.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>