bfd: ld: sframe: skip R_*_NONE relocations from input bfds

Fix PR ld/33401 - SFrame assertion when linking gav-0.9.1

As the issue demonstrates, R_*_NONE relocations are not necessarily
at the end of .sframe section (previously thought so with PR ld/33127).
Skip over R_*_NONE relocs when they are strewn intermittently inside the
.rela.sframe section.

bfd/
	PR ld/33401
	* elf-sframe.c (sframe_decoder_init_func_bfdinfo):  Skip over
	R_*_NONE relocations.