iwlwifi: nvm: enable IEEE80211_HE_PHY_CAP10_HE_MU_M1RU_MAX_LTF

The device is capable of receiving MU-MIMO frames with 8 symbols,
enable the bit here that says so.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20210802170640.90cf2eb42794.I692e6d0fde6e99a1db97d2e678952f043f48f603@changeid


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