iwlwifi: dbg: disable ini debug in 9000 family and below

Yoyo based debug is not applicable to old devices.  As init debug is
enabled by default in the driver, it needs to be disabled to work the
old debug mechanism in old devices.

Signed-off-by: Mukesh Sisodiya <mukesh.sisodiya@intel.com>
Fixes: b0d8d2c2

 ("iwlwifi: yoyo: enable yoyo by default")
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20210411132130.805401a1b8ec.I30db38184a418cfc1c5ca1a305cc14a52501d415@changeid


Signed-off-by: Luca Coelho <luciano.coelho@intel.com>