imx: Use per board ddrphy_trained_csr

Drop global ddrphy_trained_csr which maybe different with per board
ddrphy_trained_csr. DDR TOOL generates ddrphy_trained_csr for each
board, using the global ddrphy_trained_csr has risk that values may
be not up to date.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
6 files changed