staging: wilc1000: define macros for different register address for SDIO

Instead of using hardcoded value for SDIO register address added the
macro for them.

Signed-off-by: Ajay Singh <ajay.kathat@microchip.com>
Link: https://lore.kernel.org/r/20200214172250.13026-7-ajay.kathat@microchip.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>