Fix SPI entry

Author: Lauszus

usbhost.h

@@ -98,7 +98,7 @@ typedef SPi< P76, P75, P74, P10 > spi;
 #elif defined(RBL_NRF51822)
 typedef SPi< P16, P18, P17, P10 > spi;
 #elif defined(ESP8266)
-typedef SPi< SCK, MOSI, MISO, SS > spi; // Use pins defined in pins_arduino.h
+typedef SPi< P14, P13, P12, P15 > spi;
 #else
 #error "No SPI entry in usbhost.h"
 #endif