ARM: mach-shmobile: AG5EVM MIPI-DSI LCD reset delay fix

Add a 100 ms delay after the MIPI-DSI panel reset to
fix issue related to the LCD panel not starting properly
at boot up time.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>