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/utils/rs232.c b/openbsc/src/utils/rs232.c
index b322e8a..4e35cb0 100644
--- a/openbsc/src/utils/rs232.c
+++ b/openbsc/src/utils/rs232.c
@@ -100,7 +100,7 @@
 		return 0;
 	}
 
-	DEBUGP(DMI, "RS232 TX: %s\n", hexdump(msg->data, msg->len));
+	DEBUGP(DMI, "RS232 TX: %s\n", osmo_hexdump(msg->data, msg->len));
 
 	/* send over serial line */
 	written = write(bfd->fd, msg->data, msg->len);
@@ -173,7 +173,7 @@
 			if (msg->len > LAPD_HDR_LEN)
 				msg->l2h = msg->data + LAPD_HDR_LEN;
 
-			DEBUGP(DMI, "RS232 RX: %s\n", hexdump(msg->data, msg->len));
+			DEBUGP(DMI, "RS232 RX: %s\n", osmo_hexdump(msg->data, msg->len));
 			rc = handle_serial_msg(msg);
 		}
 	}