wifi: ath11k: initialize rx_mcs_80 and rx_mcs_160 before use

Currently in ath11k_peer_assoc_h_he() rx_mcs_80 and rx_mcs_160
are used to calculate max_nss, see
	if (support_160)
		max_nss = min(rx_mcs_80, rx_mcs_160);
	else
		max_nss = rx_mcs_80;

Kernel test robot complains on uninitialized symbols:
drivers/net/wireless/ath/ath11k/mac.c:2321 ath11k_peer_assoc_h_he() error: uninitialized symbol 'rx_mcs_80'.
drivers/net/wireless/ath/ath11k/mac.c:2321 ath11k_peer_assoc_h_he() error: uninitialized symbol 'rx_mcs_160'.
drivers/net/wireless/ath/ath11k/mac.c:2323 ath11k_peer_assoc_h_he() error: uninitialized symbol 'rx_mcs_80'.

This is because there are some code paths that never set them, so
the assignment of max_nss can come from uninitialized variables.
This could result in some unknown issues since a wrong peer_nss
might be passed to firmware.

Change to initialize them to an invalid value at the beginning. This
makes sense because even max_nss gets an invalid value, due to either
or both of them being invalid, we can get an valid peer_nss with
following guard:
	arg->peer_nss = min(sta->deflink.rx_nss, max_nss)

Tested-on: WCN6855 hw2.1 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.23

Fixes: 3db26ecf7114 ("ath11k: calculate the correct NSS of peer for HE capabilities")
Reported-by: kernel test robot <[email protected]>
Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/
Signed-off-by: Baochen Qiang <[email protected]>
Acked-by: Jeff Johnson <[email protected]>
Signed-off-by: Kalle Valo <[email protected]>
Link: https://msgid.link/[email protected]

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