arc, metag, nios2, or1k, tile: fix build

arc, metag, nios2, or1k, tile: fix build

Fix build regression introduced by commit
34683e3926d8c2daa368afb805da422ee7043396.

* linux/32/syscallent.h: Add sys_ prefix to ARCH_mmap and mmap.
* linux/arc/syscallent.h: Add sys_ prefix to ARCH_mmap and mmap_pgoff.
* linux/nios2/syscallent.h: Likewise.
* linux/or1k/syscallent.h: Likewise.
* linux/tile/syscallent1.h: Add sys_ prefix to ARCH_mmap and sys_mmap_4koff.
* pathtrace.c (pathtrace_match): Handle SEN_ARCH_mmap.
* NEWS: Mention this build fix.

Reported-by: Alexey Brodkin <Alexey.Brodkin@synopsys.com>