[MMC] Indicate that R1/R1b contains command opcode
Some controllers actually check the first byte of the response (most
don't). This byte contains the command opcode for R1/R1b and all 1:s
for other types. The difference must be indicated to the controller
so it knows which reply to expect.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
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