ath10k: assign 'n_cipher_suites' for WCN3990

Commit 2ea9f12c ("ath10k: add new cipher suite support") added a new
n_cipher_suites HW param with a fallback value and a warning log. Commit
03a72288 ("ath10k: wmi: add hw params entry for wcn3990") later
added WCN3990 HW entries, but it missed the n_cipher_suites.

Rather than seeing this warning every boot

  ath10k_snoc 18800000.wifi: invalid hw_params.n_cipher_suites 0

let's provide the appropriate value.

Cc: Rakesh Pillai <pillair@qti.qualcomm.com>
Cc: Govind Singh <govinds@qti.qualcomm.com>
Signed-off-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>