USB: isp1362: fix pulldown register defines and conf logic

HCHWCFG_PULLDOWN_DS2 and HCHWCFG_PULLDOWN_DS1 were swapped.  Incorrect
operator precedence in isp1362_hc_start() hid part of the problem.
This fixes a problem where Port 1 in Host mode fails to see disconnects.

Signed-Off-By: Ken MacLeod <ken@bitsko.slc.ut.us>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>