roda/rk886ex: Move dummy DCC ON# to finalize stage

During Vladimir's ACPI cleanups, this was moved into the mainboard's
enable stage, which will prevent the VGA option rom from executing
correctly. Move it to the finalize stage to make sure it runs after
all initialize functions have been called.

Change-Id: I0fcca4d4a95f89382f377ce923f82ecb71467fd8
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/6845
Reviewed-by: Vladimir Serbinenko <phcoder@gmail.com>
Tested-by: build bot (Jenkins)