tmc-etr: Check if it is mode switch action during disable etr

When switch mode with etr being enabled more than one time, it needs
to reset all the etr settings for previous mode instead of return busy.

Change-Id: I243a6d910bb3dd8ac9ca30dadbd1c6ab3cefd00f
Signed-off-by: Mao Jinlong <jinlmao@codeaurora.org>