ENGR00227568 elcdif: fix fb wait for vsync timeout when suspend and resume

ENGR00227568 elcdif: fix fb wait for vsync timeout when suspend and resume

When suspend, the lcdif and panel will be stopped. When resume, fb_set_par()
will be called, in which the lcdif and the panel will be re-initialized.
However, fb_set_par() also checks the parameters via mxc_elcdif_fb_par_equal(),
which will probably make fb_set_par() just return with them un-initialized.
And thus, the interrupt will not come. This patch added a varible to check
whether they're running along with mxc_elcdif_fb_par_equal() checking to
fix the issue. If not running, re-initialization will be forcely done.

Signed-off-by: Robby Cai <R63905@freescale.com>