greybus: sdio: remove the redefine of sdio major and minor

The macro of sdio version major and minor is defined twice.
This patch remove the redundant one.

Signed-off-by: Phong Tran <tranmanphong@gmail.com>
Reviewed-by: Rui Miguel Silva <rui.silva@linaro.org>
Reviewed-by: Mark Greer <mgreer@animalcreek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>