lvm2: enable cmdlib and dmeventd

In order to use a newer dmraid, the lvm2 package needs
to be compiled with --enable-cmdlib --enable-dmeventd, which
dmraid can then invoke on boot.

[Thomas: slightly reformat the list of configure options.]

Signed-off-by: Maxime Hadjinlian <maxime.hadjinlian@gmail.com>
Cc: Antony Vennard <arv@vx9.co.uk>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>