HACK: drm: tidss: Soft reset dispc if simple-framebuffer is absent

commit 13cff4891677a475319f732bcc268bd20d6f4280 from
git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git



If bootloader is leaving DSS active on bootup, then simple-framebuffer
needs to be enabled mandatorily to hold a reference on DSS power-domain
as otherwise Linux power management framework being can power-off DSS on
tidss probe deferral while DSS is still active, thus leading to a system
hang.

Fixes: 9b769cdf5e38 ("drm/tidss: Add some support for splash-screen")
Signed-off-by: Devarsh Thakkar <devarsht@ti.com>
Signed-off-by: Xulin Sun <xulin.sun@windriver.com>