regulator: dt-bindings: pca9450: Add nxp,pf9453 compatible string

regulator: dt-bindings: pca9450: Add nxp,pf9453 compatible string

Add the compatible string "nxp,pf9453" for the PF9453 regulator. The PF9453
is similar to the PCA9460 but supports only LDO1, LDO2, LDO_SVNS, and
BUCK[1-4].

Restrict LDO and BUCK numbers for nxp,pf9453 and keep the same restriction
for other compatible strings.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20250314-pf9453-v5-1-ab0cf1f871b0@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>