arm64: dts: qcom: x1-vivobook-s15: add Purwa-compatible device tree

arm64: dts: qcom: x1-vivobook-s15: add Purwa-compatible device tree

The ASUS Vivobook S15 (S5507) [1] is available with Hamoa and Purwa SoC.

Add the Purwa-based device tree.

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

Tested-by: Colin K. Williams <colin@li-nk.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Signed-off-by: Jens Glathe <jens.glathe@oldschoolsolutions.biz>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260214-b4-vivobook-v3-4-3c88065bbf77@oldschoolsolutions.biz
Signed-off-by: Bjorn Andersson <andersson@kernel.org>