staging: ced1401: fix a frame size warning

gcc/sparse complain about the following:

drivers/staging/ced1401/ced_ioc.c:931:1: warning: the frame size of 4144 bytes is larger than 2048 bytes [-Wframe-larger-than=]

Fix it by dynamically allocating it.

Signed-off-by: Devendra Naga <devendra.aaru@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>