[media] drx-j: put under 3-clause BSD license

Relicense the drx-j driver under a standard 3-clause BSD license, which makes
it GPL compatible.

This was done explicitly with permission from Trident Microsystems.

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