disp: msm: fix dsi debugbus in-mem logging

Update the dump_mem pointer offset while storing the debugbus
data for the second DSI to avoid overwriting to same memory.
As part of the change, register the DSI ctrl with sde_dbg from
ctrl_init directly, instead of debugfs_init to avoid code replication.

Change-Id: I4089f3038ffa89136eaea956d27270f638a99043
Signed-off-by: Veera Sundaram Sankaran <veeras@codeaurora.org>

msm/sde_dbg.c

@@ -959,6 +959,8 @@ static void _sde_dbg_dump_dsi_dbg_bus(struct sde_dbg_sde_debug_bus *bus, u32 ena
 
 		_sde_dbg_dump_bus_entry(bus, entries, bus_size, ctl_entry->base,
 					dump_addr, enable_mask);
+		if (dump_addr)
+			dump_addr += list_size / (sizeof(u32) * dsi_count);
 	}
 	mutex_unlock(&sde_dbg_dsi_mutex);