lib: utils/fdt: Add support for parsing riscv,isa-extensions

A new property has been added, with an extensive rationale at [1], that
can be used in place of "riscv,isa" to indicate what extensions are
supported by a given platform that is a list of strings rather than a
single string. There are some differences between the new property,
"riscv,isa-extensions" and the incumbent "riscv,isa" - chief among them
for the sake of parsing being the list of strings, as opposed to a
string. Another advantage is strictly defined meanings for each string
in a dt-binding, rather than deriving meaning from RVI standards. This
may likely to some divergence over time, but, at least for now, there's
no relevant differences between the two for an M-Mode program.

Add support for the new property in OpenSBI, prioritising it, before
falling back to the, now deprecated, "riscv,isa" property if it is not
present.

Link: https://lore.kernel.org/all/20230702-eats-scorebook-c951f170d29f@spud/ [1]
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Anup Patel <anup@brainfault.org>

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