hw/sd: ssi-sd: Use macros for the dummy value and tokens in the transfer

At present the codes use hardcoded numbers (0xff/0xfe) for the dummy
value and block start token. Replace them with macros.

Signed-off-by: Bin Meng <bin.meng@windriver.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20210123104016.17485-12-bmeng.cn@gmail.com>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
1 file changed