dts: introduce macro's to help with changing unit-addr
dts: introduce macro's to help with changing unit-addr

Since there are times that we include a base .dtsi file and change the
reg address we tend to end up with warnings that the reg address and
unit-address don't match.  To handle this introduce a simple DT_ADDR(x)
macro that will prepend '0x' to a 'unit-address' style address.

  #define DCCM_ADDR 80000000 /* in unit-address format */

  dccm0: dccm@DCCM_ADDR {
     reg = <DT_ADDR(DCCM_ADDR) 0x1>;
     ...
  };

This allows the dts file to override the value of DCCM_ADDR and than to
have the unit-address of the node and the reg address match.

Signed-off-by: Kumar Gala <a5e5248af4cd4f0ed8c515f61d40a6e2db46a66e@linaro.org>

nashif/zephyr,Vudentz/zephyr,galak/zephyr,nashif/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,Vudentz/zephyr,nashif/zephyr,finikorg/zephyr,nashif/zephyr,galak/zephyr,finikorg/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,Vudentz/zephyr,Vudentz/zephyr,finikorg/zephyr,galak/zephyr,zephyrproject-rtos/zephyr