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

Add PDM IPG clk.

Reviewed-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Signed-off-by: Chancel Liu <chancel.liu@nxp.com>
Signed-off-by: Jacky Bai <ping.bai@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230628061724.2056520-1-ping.bai@nxp.com


Signed-off-by: Abel Vesa <abel.vesa@linaro.org>