arch: powerpc: Rewrite the sata node to fit the driver

The sata of our powerpc platforms are updated. These changes is to
fit the driver probe.

Signed-off-by: Peng Ma <peng.ma@nxp.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>