dt-bindings: reset: add MCU HOLD BOOT ID for SCMI reset domains on stm32mp15

Add ID to SCMI0 to exposes reset controller for the MCU HOLD BOOT resource.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
Signed-off-by: Gabriel Fernandez <gabriel.fernandez@foss.st.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210617051814.12018-10-gabriel.fernandez@foss.st.com


Signed-off-by: Stephen Boyd <sboyd@kernel.org>