utils/genradconfig: drop legacy lpc32xxcdl exclusion
Commit 503252d8b095 (boot/lpc32xxcdl: remove package) forgot to remove
the special handling in genrandconfig. Since the package no longer
exists, we don't need to special-case its symbol anymore, so drop it
now.
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>