drm/i915/bios: add helper for reading SPI
Add helper for reading SPI to not duplicate the write&read combo everywhere. Signed-off-by: Jani Nikula <jani.nikula@intel.com> Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20230512111446.1524038-1-jani.nikula@intel.com
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