drivers/ddr/fsl_ddr: Make SR_IE configurable
SR_IE(Self-refresh interrupt enable) is needed for Hardware Based Self-Refresh. Make it configurable and let board code handle the rest. Signed-off-by: NJoakim Tjernlund <joakim.tjernlund@transmode.se> Reviewed-by: NYork Sun <yorksun@freescale.com>
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