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Enable DRAM ASR, auto self-refresh, unconditionally. This saves non-trivial amount of power both at runtime and in suspend (on 2x W632GU6NB-15 ~150mW). Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com> Signed-off-by: Marek Vasut <marex@denx.de> Cc: Patrick Delaunay <patrick.delaunay@foss.st.com> Cc: Patrice Chotard <patrice.chotard@foss.st.com>