talloc: revert to use talloc inside libosmocore

It's not a good idea to confuse the two changes with each other.  Moving the
Abis part into a separate library is independent from the question whether we
have talloc inside libosmocore or use a stand-alone talloc library.
diff --git a/src/e1_input_vty.c b/src/e1_input_vty.c
index 212a4ac..be51a16 100644
--- a/src/e1_input_vty.c
+++ b/src/e1_input_vty.c
@@ -31,7 +31,7 @@
 #include <osmocom/abis/e1_input.h>
 #include <osmocom/core/utils.h>
 #include <osmocom/gsm/gsm_utils.h>
-#include <talloc.h>
+#include <osmocom/core/talloc.h>
 
 #define E1_DRIVER_NAMES		"(misdn|dahdi|ipa|hsl)"
 #define E1_DRIVER_HELP		"mISDN supported E1 Card\n" \