src: use namespace prefix osmo_* for misc utils

Summary of changes:

s/bcd2char/osmo_bcd2char/g
s/char2bcd/osmo_char2bcd/g
s/hexparse/osmo_hexparse/g
s/hexdump/osmo_hexdump/g
s/hexdump_nospc/osmo_hexdump_nospc/g
s/ubit_dump/osmo_ubit_dump/g
s/static_assert/osmo_static_assert/g
diff --git a/openbsc/src/ipaccess/ipaccess-proxy.c b/openbsc/src/ipaccess/ipaccess-proxy.c
index 2717ba1..bbd5e32 100644
--- a/openbsc/src/ipaccess/ipaccess-proxy.c
+++ b/openbsc/src/ipaccess/ipaccess-proxy.c
@@ -230,7 +230,7 @@
 	}
 	msgb_put(msg, ret);
 	msg->l2h = msg->data + sizeof(*hh);
-	DEBUGP(DMI, "UDP RX: %s\n", hexdump(msg->data, msg->len));
+	DEBUGP(DMI, "UDP RX: %s\n", osmo_hexdump(msg->data, msg->len));
 
 	if (hh->len != msg->len - sizeof(*hh)) {
 		DEBUGP(DINP, "length (%u/%u) disagrees with header(%u)\n",
@@ -789,7 +789,7 @@
 
 	msgb_put(msg, ret);
 	logp_ipbc_uid(DMI, LOGL_DEBUG, ipbc, bfd->priv_nr >> 8);
-	DEBUGPC(DMI, "RX<-%s: %s\n", btsbsc, hexdump(msg->data, msg->len));
+	DEBUGPC(DMI, "RX<-%s: %s\n", btsbsc, osmo_hexdump(msg->data, msg->len));
 
 	hh = (struct ipaccess_head *) msg->data;
 	if (hh->proto == IPAC_PROTO_IPACCESS) {
@@ -861,7 +861,7 @@
 
 	logp_ipbc_uid(DMI, LOGL_DEBUG, ipbc, bfd->priv_nr >> 8);
 	DEBUGPC(DMI, "TX %04x: %s\n", bfd->priv_nr,
-		hexdump(msg->data, msg->len));
+		osmo_hexdump(msg->data, msg->len));
 
 	ret = send(bfd->fd, msg->data, msg->len, 0);
 	msgb_free(msg);