iwlwifi: nvm: update iwl_uhb_nvm_channels

Change the UHB channels to start from 1 to match the specs (11ax Draft 5.0).

Signed-off-by: Tova Mussai <tova.mussai@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>