bus: mhi: core: Rename debugfs directory name

Use MHI controller device name instead of the 'bus' device name as
debugfs dir name (e.g. /sys/kernel/debug/mhi0). That aligns with
sysfs device name.
Signed-off-by: NLoic Poulain <loic.poulain@linaro.org>
Tested-by: NJeffrey Hugo <jhugo@codeaurora.org>
Reviewed-by: NManivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: NJeffrey Hugo <jhugo@codeaurora.org>
Link: https://lore.kernel.org/r/1613403753-1457-1-git-send-email-loic.poulain@linaro.orgSigned-off-by: NManivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

drivers/bus/mhi/core/debugfs.c

@@ -377,7 +377,7 @@ static struct dentry *mhi_debugfs_root;
 void mhi_create_debugfs(struct mhi_controller *mhi_cntrl)
 {
 	mhi_cntrl->debugfs_dentry =
-			debugfs_create_dir(dev_name(mhi_cntrl->cntrl_dev),
+			debugfs_create_dir(dev_name(&mhi_cntrl->mhi_dev->dev),
 					   mhi_debugfs_root);
 
 	debugfs_create_file("states", 0444, mhi_cntrl->debugfs_dentry,