msm: kgsl: Copy over the entire list of ibs from compat to regular

Copy the entire list of struct ibdesc_compat to the regular struct
ibdesc instead of just the first entry of the list. Also allocate
memory for the list of struct ibdesc_compat.

Change-Id: I1e1ecc210a7a8009a31cac5edbb46f1bbe95db8d
Signed-off-by: Shrenuj Bansal <shrenujb@codeaurora.org>