drm/ast: Fix black screen after resume

Suspend will disable pcie device. Thus, resume should do full hw
initialization again.
Add some APIs to ast_drm_thaw() before ast_post_gpu() to fix the issue.

v2:
- fix function-call arguments

Fixes: 5b71707dd13c ("drm/ast: Enable and unlock device access early during init")
Reported-by: Cary Garrett <[email protected]>
Closes: https://lore.kernel.org/dri-devel/[email protected]/
Cc: Thomas Zimmermann <[email protected]>
Cc: Jocelyn Falempe <[email protected]>
Cc: Dave Airlie <[email protected]>
Cc: [email protected]
Cc: <[email protected]> # v6.6+
Signed-off-by: Jammy Huang <[email protected]>
Reviewed-by: Thomas Zimmermann <[email protected]>
Signed-off-by: Thomas Zimmermann <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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