staging: cxt1e1: replace OS_kmalloc/OS_kfree with kzalloc/kfree

Replace OS_kmalloc/OS_kfree with kzalloc/kfree.
And also some allocation doesn't need to use GFP_DMA
so just use GFP_KERNEL.

c4_new() function is never called, remove it.

Signed-off-by: Daeseok Youn <daeseok.youn@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>