dt-bindings: clock: imx93: Add SPDIF IPG clk

Add SPDIF IPG clk. The SPDIF IPG clock and root clock
share same clock gate.

Fixes: 1c4a4f7362fd ("arm64: dts: imx93: Add audio device nodes")
Signed-off-by: Shengjiu Wang <[e-mail]>
Reviewed-by: Frank Li <[e-mail]>
Acked-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Abel Vesa <[e-mail]>

include/dt-bindings/clock/imx93-clock.h

···
 #define IMX91_CLK_ENET2_REGULAR     204
 #define IMX91_CLK_ENET2_REGULAR_GATE		205
 #define IMX91_CLK_ENET1_QOS_TSN_GATE		206
+#define IMX93_CLK_SPDIF_IPG		207
 
 #endif