ARM: dts: qcom: apq8084: use new compat string for L2 SAW2 unit

Add SoC-specific compatibility strings to the L2 SAW2 unit. This is
to distinguish the SAW2 units related to L2 cache and the CPU cores.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20240102-saw2-spm-regulator-v7-6-0472ec237f49@linaro.org


Signed-off-by: Bjorn Andersson <andersson@kernel.org>