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/libmgcp/mgcp_protocol.c b/openbsc/src/libmgcp/mgcp_protocol.c
index bca4b31..1d26850 100644
--- a/openbsc/src/libmgcp/mgcp_protocol.c
+++ b/openbsc/src/libmgcp/mgcp_protocol.c
@@ -604,7 +604,7 @@
 	return create_response_with_sdp(endp, "CRCX", trans_id);
 error:
 	LOGP(DMGCP, LOGL_ERROR, "Malformed line: %s on 0x%x with: line_start: %d %d\n",
-		    hexdump(msg->l3h, msgb_l3len(msg)),
+		    osmo_hexdump(msg->l3h, msgb_l3len(msg)),
 		    ENDPOINT_NUMBER(endp), line_start, i);
 	return create_err_response(error_code, "CRCX", trans_id);
 
@@ -729,7 +729,7 @@
 
 error:
 	LOGP(DMGCP, LOGL_ERROR, "Malformed line: %s on 0x%x with: line_start: %d %d %d\n",
-		    hexdump(msg->l3h, msgb_l3len(msg)),
+		    osmo_hexdump(msg->l3h, msgb_l3len(msg)),
 		    ENDPOINT_NUMBER(endp), line_start, i, msg->l3h[line_start]);
 	return create_err_response(error_code, "MDCX", trans_id);
 
@@ -818,7 +818,7 @@
 
 error:
 	LOGP(DMGCP, LOGL_ERROR, "Malformed line: %s on 0x%x with: line_start: %d %d\n",
-		    hexdump(msg->l3h, msgb_l3len(msg)),
+		    osmo_hexdump(msg->l3h, msgb_l3len(msg)),
 		    ENDPOINT_NUMBER(endp), line_start, i);
 	return create_err_response(error_code, "DLCX", trans_id);