wifi: rtw88: validate RX rate to prevent out-of-bound

The reported RX rate might be unexpected, causing kernel warns:

  Rate marked as a VHT rate but data is invalid: MCS: 0, NSS: 0
  WARNING: net/mac80211/rx.c:5491 at ieee80211_rx_list+0x183/0x1020 [mac80211]

As the RX rate can be index of an array under certain conditions, validate
it to prevent accessing array out-of-bound potentially.

Tested on HP Notebook P3S95EA#ACB (kernel 6.19.9-1-cachyos):

  - No WARNING: net/mac80211/rx.c:5491 observed after the v2 patch.
The unexpected `NSS: 0, MCS: 0` VHT rate warnings are successfully
mitigated.
  - The system remains fully stable through prolonged idle periods,
high network load, active Bluetooth A2DP usage, and multiple deep
suspend/resume cycles.
  - Zero h2c timeouts or firmware lps state errors observed in dmesg.

Reported-by: Oleksandr Havrylov <goainwo@gmail.com>
Closes: https://lore.kernel.org/linux-wireless/CALdGYqSMUPnPfW-_q1RgYr0_SjoXUejAaJJr-o+jpwCk1S7ndQ@mail.gmail.com/
Tested-by: Oleksandr Havrylov <goainwo@gmail.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/20260324011001.5742-1-pkshih@realtek.com

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