meson: Improve maintainability of build options

Exploit the array type for meson options to reduce the build system and
recipe noise with respect to the trigger selection. Discussion on

meson: Improve maintainability of build options

Exploit the array type for meson options to reduce the build system and
recipe noise with respect to the trigger selection. Discussion on how
this could be achieved occurred on the associated recipe patch:

https://gerrit.openbmc-project.xyz/c/openbmc/openbmc/+/42911

Suggested-by: Patrick Williams <patrick@stwcx.xyz>
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Change-Id: Iaf38224047e24d10898063ee358e6f6164592001

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