[ARC] Corrected conditions for dynamic sections creation.

Fixed conditions to create the dynamic sections.
Previously there would be times where the dynamic sections would not be created
although they were actually required for linking to work.

Issue found through OpenADK build, more precisely the ublicb testsuite package.

bfd/ChangeLog:

    Cupertino Miranda  <cmiranda@synopsys.com>

	elf32-arc.c (elf_arc_check_relocs): Fixed conditions to generate
	dynamic sections.