iwm: add sku_cap_mimo_disable; populate sku_cap_11n_enable

This is a flag to be used to disable >1 antenna support, even if
the radio supports it.

Also populate sku_cap_11n_enable, which indicates HT is available.

It's a no-op right now; it's one of the requirements for properly
configuring HT support and transmit/receive antenna configurations.

Obtained from:  OpenBSD (at a6e25c727a2214219715b51ba6af2221d7e0d674, 22-Oct-2021)
Differential Revision: https://reviews.freebsd.org/D48210
Reviewed by:	bz

Author: Adrian Chadd

sys/dev/iwm/if_iwm.c

@@ -2220,7 +2220,8 @@ iwm_parse_nvm_data(struct iwm_softc *sc,
 	sku = iwm_get_sku(sc, nvm_sw, phy_sku);
 	data->sku_cap_band_24GHz_enable = sku & IWM_NVM_SKU_CAP_BAND_24GHZ;
 	data->sku_cap_band_52GHz_enable = sku & IWM_NVM_SKU_CAP_BAND_52GHZ;
-	data->sku_cap_11n_enable = 0;
+	data->sku_cap_11n_enable = sku & IWM_NVM_SKU_CAP_11N_ENABLE;
+	data->sku_cap_mimo_disable = sku & IWM_NVM_SKU_CAP_MIMO_DISABLE;
 
 	data->n_hw_addrs = iwm_get_n_hw_addrs(sc, nvm_sw);
 

sys/dev/iwm/if_iwmvar.h

@@ -200,6 +200,7 @@ struct iwm_nvm_data {
 	int sku_cap_11n_enable;
 	int sku_cap_amt_enable;
 	int sku_cap_ipan_enable;
+	int sku_cap_mimo_disable;
 
 	uint8_t radio_cfg_type;
 	uint8_t radio_cfg_step;