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Adding support for field firmware update over multiple command ioctl.
As multiple command ioctl is supported only from kernel 4.4, this patch
should be used against kernel 4.4 and above.

Known issues:
- There is no support for Multiple Block write commands (CMD25) in existing
  IOCTL implementation
- In case MODE_OPERATION_CODES field is not supported by the device
  manual reset of the device/platform is required.
  The reset issue discussed in another email thread - " [RFC 0/6] mmc:
  Field Firmware Update"
Signed-off-by: Yaniv Agman <yaniv.agman@sandisk.com>
Signed-off-by: Avi Shchislowski <avi.shchislowski@sandisk.com>
Signed-off-by: Chris Ball <chris@printf.net>