staging: wilc1000: fix endianness warnings reported by sparse

This patch fixes the sparse warnings by making use of le32_to_cpus() &
cpu_to_le32s() conversion API's.
Remove the unnecessary byte-order conversion in
wilc_wlan_parse_response_frame() as the data is copied using individual
byte operation.

Also added the byte-order conversion for 'header' in
wilc_wfi_monitor_rx() & wilc_wfi_p2p_rx() as received in LE byte-order.

The link [1] contains the details of discussion related to this patch.

[1]. https://patchwork.kernel.org/patch/10436791/



Signed-off-by: Ajay Singh <ajay.kathat@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>