Set new BSP_OPTS for libmm

[Hesham Moustafa]

Hi all,

I want to ask if it's OK to set new BSP options at BSP/configure.ac to
make sure this BSP supports some features or not.

For example, we can set new options like BSP_HAS_MMU,
BSP_HAS_DATA_CACHE, BSP_XXX and according to these defines generate
some useful code or just do nothing (stubs).

Regards,
Hesham