bus: ti-sysc: Fix error handling for sysc_check_active_timer()

bus: ti-sysc: Fix error handling for sysc_check_active_timer()

We have changed the return type for sysc_check_active_timer() from -EBUSY
to -ENXIO, but the gpt12 system timer fix still checks for -EBUSY. We are
also not returning on other errors like we did earlier as noted by
Pavel Machek <pavel@denx.de>.

Commit 87b14929b876 ("bus: ti-sysc: Fix gpt12 system timer issue with
reserved status") should have been updated for commit 64d55c270347
("bus: ti-sysc: suppress err msg for timers used as clockevent/source").

Let's fix the issue by checking for -ENXIO and returning on any other
errors as suggested by Pavel Machek <pavel@denx.de>.

Fixes: 87b14929b876 ("bus: ti-sysc: Fix gpt12 system timer issue with reserved status")
Depends-on: 64d55c270347 ("bus: ti-sysc: suppress err msg for timers used as clockevent/source")
Reported-by: Pavel Machek <pavel@denx.de>
Reviewed-by: Pavel Machek (CIP) <pavel@denx.de>
Cc: Grygorii Strashko <grygorii.strashko@ti.com>
Cc: Jarkko Nikula <jarkko.nikula@bitmer.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>