staging: vchiq_core: Remove stackhog in process_free_queue

This removes the stackhog in process_free_queue by allocating the
necessary memory within the recycle thread main function instead
of the stack.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>