dt-bindings: pwm: imx: Add i.MX93, i.MX94 and i.MX95 support

Add compatible string "fsl,imx93-pwm", "fsl,imx94-pwm" and "fsl,imx95-pwm",
which is backward compatible with i.MX7ULP. Set it to fall back to
"fsl,imx7ulp-pwm".

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20250306170845.240555-1-Frank.Li@nxp.com


Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>