[rv_dm] Make the RV_DM a comportable module This makes the RV_DM a comportable IP module. To this end, an Hjson description is created, leveraging the recently added topgen feature that allows for multiple TL-UL interfaces per comportable IP. This patch also modifies some of the interface signals to be compatible with the intersignal mechanism in topgen, and it adds the alert integrity alerts. Signed-off-by: Michael Schaffner <msf@opentitan.org>

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