staging: gdm724x: Fix DMA from stack

Stack allocated buffers cannot be used for DMA
on all architectures so allocate hci_packet buffer
using kmalloc.

Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Amey Narkhede <ameynarkhede03@gmail.com>
Link: https://lore.kernel.org/r/20210211053819.34858-1-ameynarkhede03@gmail.com


Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>