MGS-3367 [#imx-809] fix cma_release dump with ctrl-c

MGS-3367 [#imx-809] fix cma_release dump with ctrl-c

need release user memory before close the drmfb handle,
there is no galcore kernel interface for immediate free.

add new interface to release the user memory by force,

[  112.487090] [<ffff0000081748c0>] free_contig_range+0xa0/0xc0
[  112.492757] [<ffff0000081d944c>] cma_release+0x94/0xc0
[  112.497900] [<ffff0000085e344c>]
dma_release_from_contiguous+0x2c/0x38
[  112.504432] [<ffff000008095ab8>]
__dma_free_coherent.isra.14+0x50/0xb8
[  112.510962] [<ffff000008095b7c>] __dma_free+0x5c/0x90
[  112.516022] [<ffff0000085c56b4>] drm_gem_cma_free_object+0xa4/0x130
[  112.522293] [<ffff0000085a6384>] drm_gem_object_free+0x1c/0x58
[  112.528130] [<ffff0000085a646c>]
drm_gem_object_unreference_unlocked+0x54/0x130
[  112.535445] [<ffff0000085a65c0>]
drm_gem_object_handle_unreference_unlocked+0x60/0xb0
[  112.543281] [<ffff0000085a6664>]
drm_gem_object_release_handle+0x54/0x90
[  112.549989] [<ffff0000083c085c>] idr_for_each+0xb4/0x118
[  112.555304] [<ffff0000085a73cc>] drm_gem_release+0x24/0x38
[  112.560794] [<ffff0000085a62dc>] drm_release+0x28c/0x318
[  112.566111] [<ffff0000081df344>] __fput+0x8c/0x1d0
[  112.570906] [<ffff0000081df4ec>] ____fput+0xc/0x18
[  112.575705] [<ffff0000080d7e84>] task_work_run+0xc4/0xe0
[  112.581020] [<ffff0000080c0770>] do_exit+0x2d0/0x970
[  112.585988] [<ffff0000080c0e78>] do_group_exit+0x38/0xa0
[  112.591306] [<ffff0000080caf8c>] get_signal+0x1f4/0x508
[  112.596536] [<ffff000008087970>] do_signal+0x70/0x550
[  112.601591] [<ffff000008088080>] do_notify_resume+0x90/0xb0
[  112.607168] [<ffff000008082ddc>] work_pending+0x8/0x10

Date: Nov 14, 2017
Signed-off-by: Xianzhong <xianzhong.li@nxp.com>
Reviewed-by: Prabhu Sundararaj <prabhu.sundararaj@nxp.com>
Reviewed-by: Yuchou Gan <yuchou.gan@nxp.com>