iwlwifi: do not fail on large amount of channels

Until supporting UHB (ultra high band) channels for
devices AX210, do not fail if number of channels reported
by firmware is greater than NL80211_MAX_SUPP_REG_RULES.
The Driver in that case will use only the non-UHB channels.

Signed-off-by: Shaul Triebitz <shaul.triebitz@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>