Don't pass the first 16-bit argument via xdata.

Calling confention already uses the DPTR registers as the first two byte arguments.
So adds a lot of code to put the 16-bit value on xdata, still passes the 16-bit xdata ptr in DPTR registers, then read the xdata value.
So it doesn't save any sram bytes.

httpd/page_impl.c

@@ -165,7 +165,7 @@ void send_basic_info(void)
 }
 
 
-void send_vlan(__xdata uint16_t vlan)
+void send_vlan(uint16_t vlan)
 {
 	slen = strtox(outbuf, HTTP_RESPONCE_JSON);
 	print_string("sending VLAN\n");