v7 changelog for mmc ioctl patch

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change history for this patch:

- v7
    - simplify 32-bit/64-bit buffer pointer portability
    - add pad member to struct mmc_ioc_cmd so its size is the same
      when built for either 32-bit or 64-bit.
    - register ``0xB3`` in Documentation/ioctl/ioctl-number.txt

- v6
    - refix 32+64 compat pointer for better portability
    - copy userspace pointer *before* using
    - apply upper limit to data buffer size
    - add flag to allow normal CMD opcodes as well as ACMD opcodes
    - remove unnecessary mutex grab

- v5
    - fix 32-bit compiler warning about the 32+64 compat pointer

- v4
    - replace postsleep udelay() with usleep_range()
    - add cmd_timeout_ms field for R1B commands

- v3
    - copy data from userspace before claiming host
    - break out copy from userspace into its own function
    - verify that caller has CAP_SYS_RAWIO
    - rename ``struct sd_ioc_cmd`` to ``struct mmc_ioc_cmd`` because it
      applies generally, not just to SD
    - make struct mmc_ioc_cmd the same between 32-bit and 64-bit to
      simplify compat_ioctl()
    - export include/linux/mmc/ioctl.h when you ``make headers_install``

- v2
    - make initialization of struct declarations match kernel style
    - only allow ioctl() on whole block device, not partition
    - remove extraneous printks
    - implement compat_ioctl()
    - remove version field from ``struct sd_ioc_cmd``

John
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