drm/amd/display: Fix vblank refcount in vrr transition

drm/amd/display: Fix vblank refcount in vrr transition

manage_dm_interrupts disable/enable vblank using drm_crtc_vblank_off/on
which causes drm_crtc_vblank_get in vrr_transition to fail, and later
when drm_crtc_vblank_put is called the refcount on vblank will be messed
up. Therefore move the call to after manage_dm_interrupts.

Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1247
Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1380

Tested-by: Daniel Wheeler <[email protected]>
Reviewed-by: Rodrigo Siqueira <[email protected]>
Signed-off-by: Yunxiang Li <[email protected]>
Signed-off-by: Rodrigo Siqueira <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
Cc: [email protected]