multiplier suffixes are short, store them directly in struct suffix_mult

multiplier suffixes are short, store them directly in struct suffix_mult

function                                             old     new   delta
xstrtoul_range_sfx                                   226     217      -9
xstrtoull_range_sfx                                  291     280     -11
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(add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-20)             Total: -20 bytes
   text    data     bss     dec     hex filename
 669128    2668   13616  685412   a7564 busybox_old
 669108    2668   13616  685392   a7550 busybox_unstripped