e1d: Initial osmo-e1d support

osmo-e1d is part of the Osmocom 'software defined E1 interface,
which consists of a USB device for the actual E1 hardware interfacing,
and a daemon (osmo-e1d) implementing a libusb-based driver.

This commit adds initial support for talking to osmo-e1d using
the related libosmoe1d library.  You need to use '--enable-e1d'
at configure time to enable it.

Change-Id: Ia0431c124e3b5b4108aee7b109d8c4bb0d8b45d4
Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
diff --git a/src/e1_input_vty.c b/src/e1_input_vty.c
index d81c859..a1943e6 100644
--- a/src/e1_input_vty.c
+++ b/src/e1_input_vty.c
@@ -41,7 +41,7 @@
 
 /* CONFIG */
 
-#define E1_DRIVER_NAMES		"(misdn|misdn_lapd|dahdi|ipa|unixsocket)"
+#define E1_DRIVER_NAMES		"(misdn|misdn_lapd|dahdi|e1d|ipa|unixsocket)"
 #define E1_DRIVER_HELP		"mISDN supported E1 Card (kernel LAPD)\n" \
 				"mISDN supported E1 Card (userspace LAPD)\n" \
 				"DAHDI supported E1/T1/J1 Card\n" \