dt-bindings: spmi: Add X1E80100 SPMI PMIC ARB schema

dt-bindings: spmi: Add X1E80100 SPMI PMIC ARB schema

Add dedicated schema for X1E80100 PMIC ARB. This is not the first
platform to introduce multiple buses. In fact, all platforms that
implement the version 7 for the SPMI PMIC arbiter have multiple buses.
Since the compatible should not be version based, the platform specific
one is used. The X1E80100 platform is the first platform to really need
the second master, as all the available boards have the PMICs that
provide the eUSB2 repeater on the second bus.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
Link: https://lore.kernel.org/r/20240417-spmi-multi-master-support-v10-1-5bc6d322e266@linaro.org
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lore.kernel.org/r/20240507210809.3479953-7-sboyd@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>