spmi: pmic-arb: Add multi bus support

spmi: pmic-arb: Add multi bus support

Starting with HW version 7, there are actually two separate buses
(with two separate sets of wires). So add support for the second bus.
The first platform that needs this support for the second bus is the
Qualcomm X1 Elite, so add the compatible for it as well.

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
Link: https://lore.kernel.org/r/20240417-spmi-multi-master-support-v10-7-5bc6d322e266@linaro.org
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lore.kernel.org/r/20240507210809.3479953-13-sboyd@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>