fix for unPhone hangs during boot without sd card present (#3709)

* work around sd card hang if not present

* comment out the define for HAS_SDCARD

variants/unphone/variant.h

@@ -48,7 +48,7 @@
 #undef GPS_RX_PIN
 #undef GPS_TX_PIN
 
-#define HAS_SDCARD 1
+// #define HAS_SDCARD 1 // causes hang if defined
 #define SDCARD_CS 43
 
 #define LED_PIN 13 // the red part of the RGB LED