arm64: dts: qcom: x1e80100: Add SPMI support

arm64: dts: qcom: x1e80100: Add SPMI support

The X1E80100 platform implements the v7 SPMI arbiter, which means it
implements two separate buses. The difference, when compared to existing
platforms that also implement v7 SPMI arbiter, is that this is the first
platform that actually has boards with secondary bus populated with some
PMICs. This is why it needs to have 2 separate buses as child nodes of
the arbiter.

Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
Link: https://lore.kernel.org/r/20240222-x1e80100-dts-smb2360-v3-1-85a691d4f68a@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>