In preparation of introducing eMMC support which have different CSD/CID structures, introduce a pair of handlers in SDCardClass. Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Cédric Le Goater <clg@redhat.com> Tested-by: Andrew Jeffery <andrew@codeconstruct.com.au> Tested-by: Cédric Le Goater <clg@redhat.com> Message-Id: <20240628070216.92609-82-philmd@linaro.org>