mhi: add snapshot for MHI driver stack

Add snapshot for MHI driver stack from msm-4.19 commit
6cc10bff8d4a ("Bluetooth: Re-initialize regulator to NULL on error").
Additional changes are made to pass check_patch errors.

Change-Id: I4dbe727e25d01967dd9cbe60125af47d3bab3f20
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>

include/linux/mod_devicetable.h

@@ -820,4 +820,17 @@ struct wmi_device_id {
 	const void *context;
 };
 
+#define MHI_NAME_SIZE 32
+
+/**
+ * struct mhi_device_id - MHI device identification
+ * @chan: MHI channel name
+ * @driver_data: driver data;
+ */
+
+struct mhi_device_id {
+	const char chan[MHI_NAME_SIZE];
+	kernel_ulong_t driver_data;
+};
+
 #endif /* LINUX_MOD_DEVICETABLE_H */