Get rid of RTE_Device_917.h

[jerome-pouiller]

RTE_Device_917.h describes a board. However, with Zephyr, the description will come from the Device Tree. RTE_Device_917.h, but none of components used by Zephyr should include it.

Normally, the right way to drop RTE_Device_917.h is to place the hardware parameters in structs rather than in #define. The structs can be populated at runtime, it is easier to translate hardware configuration from one system to another.