staging: wlags49_h2: Reformat TX_CNTL comment

This tabular comment is useful, but the original tabbed layout
is for a tab-wdth of 4. Reformat with spaces.

Signed-off-by: David Kilroy <kilroyd@googlemail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>