or32: add uClibc_page.h
or32: add uClibc_page.h

OR32 uses 8k pages, so it's imperative that we have this file with the
definition of PAGE_SIZE as the default value is otherwise 4k.  For
OR32, mmap2 expects a PAGE_SIZE-aligned offset (some architectures do
this differently), so specify this here.

skristiansson/uClibc-or1k,skristiansson/uClibc-or1k,skristiansson/uClibc-or1k,skristiansson/uClibc-or1k