iwlwifi: fix Kconfig issues

Randy fixes a few issues in iwlwifi's Kconfig. Because of
this, 'Debugging options' was not indented under iwlwifi
using menuconfig.

I added a few other fixes on the way, like the link to the
website and added 7265 in the supported NICs.

Reported-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
[ Commit message + other fixes ]
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>