clk: mediatek: mt2701-vdec: fix conversion to mtk_clk_simple_probe

Commit 973d1607d936 ("clk: mediatek: mt2701: use mtk_clk_simple_probe to
simplify driver") broke DT bindings as the highest index was reduced by
1 because the id count starts from 1 and not from 0.

Fix this, like for other drivers which had the same issue, by adding a
dummy clk at index 0.

Fixes: 973d1607d936 ("clk: mediatek: mt2701: use mtk_clk_simple_probe to simplify driver")
Cc: [e-mail]
Signed-off-by: Daniel Golle <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Reviewed-by: AngeloGioacchino Del Regno <[e-mail]>
Signed-off-by: Stephen Boyd <[e-mail]>

drivers/clk/mediatek/clk-mt2701-vdec.c

···
 	GATE_MTK(_id, _name, _parent, &vdec1_cg_regs, _shift, &mtk_clk_gate_ops_setclr_inv)
 
 static const struct mtk_gate vdec_clks[] = {
+	GATE_DUMMY(CLK_DUMMY, "vdec_dummy"),
 	GATE_VDEC0(CLK_VDEC_CKGEN, "vdec_cken", "vdec_sel", 0),
 	GATE_VDEC1(CLK_VDEC_LARB, "vdec_larb_cken", "mm_sel", 0),
 };