bus: mhi: host: Change the trace string for the userspace tools mapping

User space tools can't map strings if we use directly, as the string
address is internal to kernel.

So add trace point strings for the user space tools to map strings
properly.
Suggested-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Krishna chaitanya chundru <quic_krichai@quicinc.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20240218-ftrace_string-v1-1-27da85c1f844@quicinc.comSigned-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

drivers/bus/mhi/host/main.c

@@ -1340,7 +1340,7 @@ static int mhi_update_channel_state(struct mhi_controller *mhi_cntrl,
 	enum mhi_cmd_type cmd = MHI_CMD_NOP;
 	int ret;
 
-	trace_mhi_channel_command_start(mhi_cntrl, mhi_chan, to_state, "Updating");
+	trace_mhi_channel_command_start(mhi_cntrl, mhi_chan, to_state, TPS("Updating"));
 	switch (to_state) {
 	case MHI_CH_STATE_TYPE_RESET:
 		write_lock_irq(&mhi_chan->lock);
@@ -1407,7 +1407,7 @@ static int mhi_update_channel_state(struct mhi_controller *mhi_cntrl,
 		write_unlock_irq(&mhi_chan->lock);
 	}
 
-	trace_mhi_channel_command_end(mhi_cntrl, mhi_chan, to_state, "Updated");
+	trace_mhi_channel_command_end(mhi_cntrl, mhi_chan, to_state, TPS("Updated"));
 exit_channel_update:
 	mhi_cntrl->runtime_put(mhi_cntrl);
 	mhi_device_put(mhi_cntrl->mhi_dev);

drivers/bus/mhi/host/trace.h

@@ -84,6 +84,8 @@ DEV_ST_TRANSITION_LIST
 #define dev_st_trans(a, b)		{ DEV_ST_TRANSITION_##a, b },
 #define dev_st_trans_end(a, b)		{ DEV_ST_TRANSITION_##a, b }
 
+#define TPS(x)	tracepoint_string(x)
+
 TRACE_EVENT(mhi_gen_tre,
 
 	TP_PROTO(struct mhi_controller *mhi_cntrl, struct mhi_chan *mhi_chan,