drivers: wifi: esp32: Fix AP-STA mode interface init order

Wi-Fi AP-STA mode fails on ESP32 due to incorrect interface
initialization. In AP-STA mode, esp32_wifi_init first sets the driver's AP
interface, followed by the STA interface. However, the driver initializes
them in reverse order, causing both to read incorrect device data and
resulting in a "Wi-Fi not in station mode" error.
This fix handles STA and AP initialization in separate functions and
checks for correct mode in esp32_wifi_status.
Tested on a custom ESP32-S3-WROOM-1-N4R2 board, where both STA and AP
can connect, send, and receive data.

Signed-off-by: Oskari Seppä <seppaoskari@gmail.com>