[media] drx-j: be sure to send the powerup command at device open

As drxj_close puts the device in powerdown, we need to power it up
properly at drxj_open.

This is the behavior noticed at the Windows driver.

Acked-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>