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In preparation for adding support for DVFSRC Version 4, add a new `has_emi_ddr` member to struct dvfsrc_soc_data: if true, write the DRAM bandwidth both to the BW_AVG and to the newly defined EMI_BW register, present only on DVFSRC v4. Currently supported SoCs will not use this, as has_emi_ddr is left out from their platform data, hence reading false. Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>