[top_earlgrey] Depend on core providing tlul_pkg.sv
[top_earlgrey] Depend on core providing tlul_pkg.sv

`top_earlgrey.sv` uses the `tlul_pkg`, it therefore needs to be a
dependency.

Signed-off-by: Philipp Wagner <5a4b10454c30419e54a1570be358a516ff84bb63@lowrisc.org>

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