hw/sd/sdcard: Add mmc SWITCH function support (CMD6)

hw/sd/sdcard: Add mmc SWITCH function support (CMD6)

switch operation in mmc cards, updated the ext_csd register to
request changes in card operations. Here we implement similar
sequence but requests are mostly dummy and make no change.

Implement SWITCH_ERROR if the write operation offset goes beyond
length of ext_csd.

Signed-off-by: Sai Pavan Boddu <sai.pavan.boddu@xilinx.com>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
[PMD: Convert to SDProto handlers, add trace events]
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Andrew Jeffery <andrew@codeconstruct.com.au>
Tested-by: Cédric Le Goater <clg@redhat.com>
Message-Id: <20240712162719.88165-11-philmd@linaro.org>