amd7930_fn.h defined a static array, which however was only used in
one of the files which include amd7930_fn.h. So move the array to the
file where it is actually referenced.

While we're at it, do some more cleanup like removing the #defines
for BYTE,WORD and use u16,u8 instead - WORD was even wrongly defined
to unsigned int. Also, convert some macros to inlines etc.