gas/arc: Use BFD_VMA_FMT for printf format specifier

gas/arc: Use BFD_VMA_FMT for printf format specifier

Some debug code has the wrong printf format specifier for some types
that are (ultimately) bfd_vma.  Fixed by using BFD_VMA_FMT string.  This
only becomes an issue when building the tc-arc.c file with -DDEBUG=1 to
build in the debug code.

gas/ChangeLog:

	* config/tc-arc.c (md_pcrel_from_section): Use BFD_VMA_FMT where
	appropriate.
	(md_convert_frag): Likewise.