USB: s3c-hsotg: Tone down debugging

Currently the s3c-hsotg driver is extremely chatty, producing voluminous
with large register dumps even in default operation. Tone this down so
we're not chatty unless DEBUG is defined.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>