clk: versaclock3: Update vc3_get_div() to avoid divide by zero

Update vc3_get_div() to avoid divide by zero operation on
vc3_div_round_rate() by returning1, if there is no table match
found.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Link: https://lore.kernel.org/r/20231122142310.203169-2-biju.das.jz@bp.renesas.com


Signed-off-by: Stephen Boyd <sboyd@kernel.org>