drivers: Fix build errors with DEBUGFS_FS disabled

When CONFIG_DEBUG_FS is disabled, build errors are seen in the
following 2 drivers:

1. bpmpfw - The build error was seen because bpmp-debugfs.c was
getting compiled even when CONFIG_DEBUG_FS was disabled.

2. ufs - The build error was seen due to a couple of reasons:
- Function debugfs_provision_init is defined in a file that is
protected with CONFIG_DEBUG_FS, but is called from another file
unconditionally.
- In ufs-tegra-common.c, there are calls to debugfs_* functions, but
inclusion of the standard header debugfs.h is protected under
CONFIG_DEBUG_FS.

Fix these issues with this change.

Bug 4164776

Change-Id: Iae6384fd2352e55aed2a0ea85e778be6c26a4d54
Signed-off-by: Bharat Nihalani <bnihalani@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/2926891
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>

drivers/firmware/tegra/Makefile

@@ -14,7 +14,7 @@ obj-m		+= ivc_ext.o
 tegra_bpmp-y	+= ../../clk/tegra/clk-bpmp.o
 tegra_bpmp-y	+= ../../reset/tegra/reset-bpmp.o
 tegra_bpmp-y	+= ../../soc/tegra/powergate-bpmp.o
-tegra_bpmp-y	+= bpmp-debugfs.o
+tegra_bpmp-$(CONFIG_DEBUG_FS)	+= bpmp-debugfs.o
 tegra_bpmp-y	+= bpmp-tegra186-hv.o
 obj-m 		+= tegra_bpmp.o
 endif

drivers/scsi/ufs/ufs-provision.h

@@ -17,6 +17,15 @@
 #include <linux/debugfs.h>
 void debugfs_provision_init(struct ufs_hba *hba, struct dentry *device_root);
 void debugfs_provision_exit(struct ufs_hba *hba);
+#else
+static inline void debugfs_provision_init(struct ufs_hba *hba, struct dentry *device_root)
+{
+	return;
+}
+static inline void debugfs_provision_exit(struct ufs_hba *hba)
+{
+	return;
+}
 #endif
 
 #endif

drivers/scsi/ufs/ufs-tegra-common.c

@@ -19,9 +19,7 @@
 #include <linux/iommu.h>
 #include <linux/pinctrl/consumer.h>
 
-#ifdef CONFIG_DEBUG_FS
 #include <linux/debugfs.h>
-#endif
 
 #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 16, 0)
 #include <drivers-private/scsi/ufs/k515/ufshcd-pltfrm.h>