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The bounce buffer is used by a few drivers (most of the MMC drivers) to overcome limitations in their respective DMA implementation. This moves the configuration to Kconfig and makes it user-selectable (even though it will be a required feature to make those drivers work): the expected usage is for drivers depending on this to 'select' it unconditionally from their respective Kconfig (see follow-up patches). This commit includes a full migration using moveconfig.py to ensure that each commit compiles. To ensure bisectability we update dependencies of various drivers to now select BOUNCE_BUFFER when needed. [trini: Squash all patches to ensure bisectability] Signed-off-by: Tom Rini <trini@konsulko.com> Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com> Reviewed-by: Otavio Salvador <otavio@ossystems.com.br> [dw_mmc portion] Reviewed-by: Fabio Estevam <festevam@gmail.com> [mxsmmc portion] Reviewed-by: Simon Glass <sjg@chromium.org> [tegra portion]