dt-bindings: arm: qcom: Add ASUS Vivobook X1P42100 variant

dt-bindings: arm: qcom: Add ASUS Vivobook X1P42100 variant

The ASUS Vivobook S15 (S5507) [1] is available with Hamoa and Purwa SoC.
Add the Purwa-based variant:

asus,vivobook-s15-x1p4 compatible to Purwa SoC

[1]: https://www.asus.com/de/laptops/for-home/vivobook/asus-vivobook-s-15-s5507/techspec/

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Signed-off-by: Jens Glathe <jens.glathe@oldschoolsolutions.biz>
Link: https://lore.kernel.org/r/20260214-b4-vivobook-v3-1-3c88065bbf77@oldschoolsolutions.biz
Signed-off-by: Bjorn Andersson <andersson@kernel.org>