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

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

Fixes: 1c4a4f7 ("arm64: dts: imx93: Add audio device nodes")
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20241119015805.3840606-2-shengjiu.wang@nxp.com
Signed-off-by: Abel Vesa <abel.vesa@linaro.org>

Author: TE-N-ShengjiuWang

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

@@ -209,5 +209,6 @@
 #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