fbcon: don't suspend/resume when vc is graphics mode

fbcon: don't suspend/resume when vc is graphics mode

Don't need to do suspend/resume for fbcon in graphic mode.

Doing this may cause error, eg:
  At the beginning, starting the Xorg with single screen and then an
  external screen was plugged in. After logging out in Xorg, fbdev
  info may using screen which is connected later on for info always
  using first connected connector in list in func 'drm_setup_crtcs_fb'.
  Then, S3 executed, fbcon found that the information did not match
  and do atomic to switch fb. However, Xorg will not re-bind the crtc
  fb but continues doing ioctl. At this time, the fb is incorrect.

With some modifications by Helge Deller.

Signed-off-by: Lu Yao <yaolu@kylinos.cn>
Signed-off-by: Helge Deller <deller@gmx.de>