linux-phytec-ti

drm/tidss: dispc7: update max pclk rate

Max pclk rate on J721E is 600MHz. Update the limit in the driver, which
was a copy from AM6.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: Jyri Sarha <jsarha@ti.com>