drm/rockchip: mipi: move mode_set/commit to enable ops

drm/rockchip: mipi: move mode_set/commit to enable ops

enable/disable ops is more compatile to drm atomic framework.

fix mipi driver crash when resume:
[  195.399833] PC is at drm_mode_vrefresh+0x0/0x78
[  195.400249] LR is at dw_mipi_dsi_encoder_commit+0x2ec/0x424
[  195.400749] pc : [<ffffff800845ee7c>] lr : [<ffffff800846f190>] pstate: 20000145
[  195.529911] [<ffffff800845ee7c>] drm_mode_vrefresh+0x0/0x78
[  195.530421] [<ffffff80084441e0>] drm_atomic_helper_commit_modeset_enables+0x168/0x190
[  195.531126] [<ffffff80084733b4>] rockchip_atomic_commit_complete+0x3c/0x14c
[  195.531753] [<ffffff8008473540>] rockchip_drm_atomic_commit+0x7c/0x9c
[  195.532336] [<ffffff8008467b60>] drm_atomic_commit+0x6c/0x84
[  195.532849] [<ffffff80084447fc>] drm_atomic_helper_connector_dpms+0xf4/0x154
[  195.533481] [<ffffff800845d21c>] drm_mode_obj_set_property_ioctl+0x148/0x204
[  195.534113] [<ffffff800845d318>] drm_mode_connector_property_set_ioctl+0x40/0x60
[  195.534778] [<ffffff800844dba4>] drm_ioctl+0x270/0x3fc
[  195.535249] [<ffffff80081b9180>] do_vfs_ioctl+0x4d0/0x5bc
[  195.535739] [<ffffff80081b92cc>] SyS_ioctl+0x60/0x88
[  195.536194] [<ffffff80080826f0>] el0_svc_naked+0x24/0x28

Change-Id: Ic80f364a4297e7318c3f0316dd4100737ad7ff6e
Signed-off-by: Mark Yao <mark.yao@rock-chips.com>