drivers: wifi: eswifi: Fully populate sockaddr_in on async msg

Updating the eswifi driver to provide port information (along with
IP / net context) whenever an async message is received. This is
needed to fully populate the "remote" info in "net_context"
required whenever net_context_send is called.

Also adding code to populate "remote" info in "net_context"..

Tested with STM32 disco IOT kit. Fixes #25621

Signed-off-by: Bilal Wasim <bilalwasim676@gmail.com>