add support for LGT8F cpu

Author: jayzakk

Adafruit_SPITFT.cpp

@@ -40,7 +40,12 @@
 #define AVR_WRITESPI(x)                                                        \
   for (SPI0_DATA = (x); (!(SPI0_INTFLAGS & _BV(SPI_IF_bp)));)
 #elif defined(__LGT8F__)
-#define AVR_WRITESPI(x) SPDR = (x);asm volatile("nop");while((SPFR & _BV(RDEMPT)));SPFR = _BV(RDEMPT) | _BV(WREMPT)
+#define AVR_WRITESPI(x)                                                        \
+  SPDR = (x);                                                                  \
+  asm volatile("nop");                                                         \
+  while ((SPFR & _BV(RDEMPT)))                                                 \
+    ;                                                                          \
+  SPFR = _BV(RDEMPT) | _BV(WREMPT)
 #else
 #define AVR_WRITESPI(x) for (SPDR = (x); (!(SPSR & _BV(SPIF)));)
 #endif