This changes the API of xfa from
XFA(array_name, prio) type element_name = INITIALIZER;
to
XFA(type, array_name, prio) element_name = INITIALIZER;
this allows forcing natural alignment of the type, fixing failing tests
on `native64`.
The macros CONCAT(), MIN(), and MAX() are defined over and over again in
RIOT's code base. This de-duplicates the code by moving the macros to a
common place.
SD cards are usually larger than 4 GiB, so using 32 bit addressing will
break once they are filled to a certain extend.
Implement read_page() and write_page() which at a page size of 512
should work for SD cards of up to 2 TiB.
The read() and write() functions will ignore any offset that is not aligned
with the page boundary, so do the same for the new functions, but at least
report an error.
