dt-bindings: clock: Add i.MX91 clock support

i.MX91 has similar Clock Control Module(CCM) design as i.MX93, only add
few new clock compared to i.MX93.
Add a new compatible string and some new clocks for i.MX91.

Signed-off-by: Pengfei Li <[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]>

Documentation/devicetree/bindings/clock/imx93-clock.yaml

···
 properties:
   compatible:
     enum:
+      - fsl,imx91-ccm
       - fsl,imx93-ccm
 
   reg:

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

···
 #define IMX93_CLK_A55_SEL		199
 #define IMX93_CLK_A55_CORE		200
 #define IMX93_CLK_PDM_IPG		201
+#define IMX91_CLK_ENET1_QOS_TSN     202
+#define IMX91_CLK_ENET_TIMER        203
+#define IMX91_CLK_ENET2_REGULAR     204
+#define IMX91_CLK_ENET2_REGULAR_GATE		205
+#define IMX91_CLK_ENET1_QOS_TSN_GATE		206
 
 #endif