lib: utils/timer: mtimer: Select the reference mtimer from a DT property

The current selection of the reference MTIMER may fail in some setup.
In a multi-cluster configuration, there is one MTIMER per cluster, each
associated with the HARTS of the cluster. So we do not have a MTIMER
with no associated HARTs to use as our reference.

To be able to select a reference MTIMER in that case, look up an optional
device tree property named "riscv,reference-mtimer" that indicate which
MTIMER is the reference.

Signed-off-by: Benoît Monin <[email protected]>
Reviewed-by: Anup Patel <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Anup Patel <[email protected]>

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