staging: wilc1000: rename u8P2Precvrandom variable

This patch renames u8P2Precvrandom variable to p2p_recv_random
to avoid camelcase.

Signed-off-by: Leo Kim <leo.kim@atmel.com>
Signed-off-by: Glen Lee <glen.lee@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>