drivers: scmi-msg: fix clock min/max/step triplet description support

The return value of plat_scmi_clock_rates_array() is one of "SCMI_DENIED",
"SCMI_GENERIC_ERROR" and "SCMI_SUCCESS".
The code in

drivers: scmi-msg: fix clock min/max/step triplet description support

The return value of plat_scmi_clock_rates_array() is one of "SCMI_DENIED",
"SCMI_GENERIC_ERROR" and "SCMI_SUCCESS".
The code in scmi_clock_describe_rates() for clock min/max/step triplet
description support would never be executed due to the return value of
plat_scmi_clock_rates_array() could never be "SCMI_NOT_SUPPORTED".
Fix by modifying the return value of plat_scmi_clock_rates_array().

Signed-off-by: Tony Han <tony.han@microchip.com>
Reviewed-by: Etienne Carriere <etienne.carriere@foss.st.com>

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drivers: scmi-msg: add support for clock using generic clock framework

Integrating the clock framework with SCMI allows to avoid boilerplate
code to do so in platform specific files. This patch adds

drivers: scmi-msg: add support for clock using generic clock framework

Integrating the clock framework with SCMI allows to avoid boilerplate
code to do so in platform specific files. This patch adds a generic
layer that uses the generic clock framework to access and expose clocks.
SCMI clocks can be added from platform code using scmi_clk_add().
A new CFG_SCMI_MSG_USE_CLK configuration option is added to enable
this generic clock support.

Signed-off-by: Clément Léger <clement.leger@bootlin.com>
Signed-off-by: Thomas Perrot <thomas.perrot@bootlin.com>
Acked-by: Etienne Carriere <etienne.carriere@linaro.org>

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