i2c-taos-evm: Fix log messages

commit 9b640f2e upstream.

* Print all error and information messages even when debugging is
  disabled.
* Don't use adapter device to log messages before it is ready.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Andi Kleen <ak@linux.intel.com>