lisa.platforms.platinfo: Make kernel/symbols-address deferred
lisa.platforms.platinfo: Make kernel/symbols-address deferred

Since it's not used that often but uses a fair amount of memory and disk storage
when serialized, avoid fetching the symbols address unless needed.

ARM-software/lisa,credp/lisa,ARM-software/lisa,credp/lisa,ARM-software/lisa,credp/lisa,ARM-software/lisa,credp/lisa