Allow macro expansion within symbol names

The C implementation supports this (though it's undocumented, and unused
to far).

This can be used e.g. to dynamically instatiate symbols from template
files:

Kconfig.template:

    config $(subsys)_LOG
	bool "Enable logging for $(subsys)"
	depends on $(subsys)_HAS_LOG

    ... other stuff dependent on $(subsys)

Elsewhere:

    subsys = FOO
    source "Kconfig.template"

    subsys = BAR
    source "Kconfig.template"

Pretty sure this can easily be abused, but it should be supported at
least.

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