arm64: dts: imx8mp: Fix pgc vpu locations

The various pgv_vpu nodes have a mismatch between the value after
the @ symbol and what is referenced by 'reg' so reorder the nodes
to align.

Fixes: df680992 ("arm64: dts: imx8mp: add vpu pgc nodes")
Suggested-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Signed-off-by: Adam Ford <aford173@gmail.com>
Reviewd-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>