gdc: add gdc cpu cost optimize [1/2]

gdc: add gdc cpu cost optimize [1/2]

PD#SWPL-7422

Problem:
gdc ioctl have cpu usage issue

Solution:
1. dma buffer alloc gdc module,when dma buf exported, fd and phys
address can be recorded.driver can get phys address via fd internally.
2. dmabuf alloc by other driver module, need used gdc_dma_buffer_map/
gdc_dma_buffer_unmap to get phys address.

Verify:
Newman & W400 board

Change-Id: Ie270589a19dfae4fa750241fb5721154221f2448
Signed-off-by: Pengcheng Chen <pengcheng.chen@amlogic.com>