fixup!fixup! [nrf noup] zephyr: Add support for WPA CLI zephyr

In case of failure from control interface, check and propagate the error to the caller.

Signed-off-by: Chaitanya Tata <Chaitanya.Tata@nordicsemi.no>

This reverts commit a42ccc3.

Closing socket on EoF is a proper behaviour, else we keep getting zero
byte receives which are useless. The socket is now unusable.

Signed-off-by: Chaitanya Tata <Chaitanya.Tata@nordicsemi.no>

fixup! [nrf noup] zephyr: Add support for global control interface

The below fixes from non-global control interface are ported:

1. Dummy receive in case of memory allocation failures
2. Identify EoF and close the socket.

Signed-off-by: Chaitanya Tata <Chaitanya.Tata@nordicsemi.no>

Relying on heap during OOM is bad, esp. for critical module like WPA
supplicant, this can break the Wi-Fi.

As the WPA supplicant stack is large enough and we have reduced the
control interface sizes, move the buffers for control interface to
stack or use static variable.

The static variable is used to keep the changes to the common code of
the WPA supplicant to a minimum compared to using stack.

Fixes SHEL-2283.

Signed-off-by: Chaitanya Tata <Chaitanya.Tata@nordicsemi.no>

This can be same as non-global control interface, for interface command
the output is limited to 1024.

Signed-off-by: Chaitanya Tata <Chaitanya.Tata@nordicsemi.no>