spu: .note.spu_name

This fixes a bug with the .note.spu_name section flags, which were
made SEC_LOAD without SEC_ALLOC.  That combination doesn't really make
sense and led to odd layout behaviour.  In addition .note.spu_name
now uses the normal note alignment, with some tweaks to keep its file
offset 16 byte aligned.  This tends to work better in the testsuite
when the standard scripts are not used and the note is merged with
other notes.

bfd/
	* elf32-spu.c (spu_elf_create_sections): Remove SEC_LOAD from
	.note.spu_name, and align to 4 bytes.
	(spu_elf_fake_sections): Tweak .note.spu_name output section
	alignment for layout.
	(spu_elf_final_write_processing): New function.
	(elf_backend_final_write_processing): Define.
binutils/
	* testsuite/binutils-all/objcopy.exp (pr25662): Don't xfail spu.
ld/
	* testsuite/ld-elf/orphan-region.d: Don't xfail spu.
	* testsuite/ld-elf/pr23658-1e.d: Likewise.
	* testsuite/ld-scripts/provide-8.d: Likewise.
	* testsuite/ld-spu/ovl.d: Remove commented out old matches.
	Adjust expected overlay file offset.
	* testsuite/ld-spu/ovl2.d: Likewise.