wifi: rtl8xxxu: Print the ROM version too

Make rtl8xxxu_print_chipinfo() print the ROM version. This is relevant
at least for the RTL8723AU and possibly relevant for the RTL8710BU.

Signed-off-by: Bitterblue Smith <rtl8821cerfe2@gmail.com>
Reviewed-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/add46396-95af-1164-2033-7d4eb4d0b554@gmail.com