wifi: wl18xx: add support for reading 8.9.1 fw status

wifi: wl18xx: add support for reading 8.9.1 fw status

Add the necessary code to read the 8.9.1 firmware status into the
driver private status structure, augmenting the 8.9.0 firmware
status code. New structure layout taken from:

https://git.ti.com/cgit/wilink8-wlan/build-utilites/tree/patches/kernel_patches/4.19.38/0023-wlcore-Fixing-PN-drift-on-encrypted-link-after-recov.patch?h=r8.9&id=a2ee50aa5190ed3b334373d6cd09b1bff56ffcf7

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://msgid.link/E1sBsyC-00E8w0-Rz@rmk-PC.armlinux.org.uk