sensible defaults and get rid of what ever lora32_freq was

include/esp32-lora.h

@@ -101,7 +101,7 @@
   .bandwidth = 7,\
   .codingRate = 5,\
   .frequency = 915000000,\
-  .spreadingFactor = 11,\
+  .spreadingFactor = 8,\
   .preamble = DEFAULT_PREAMBLE,\
   .implicitHeader = false,\
   .useCRC = false,\
@@ -109,18 +109,14 @@
   .copi = 23,\
   .cipo = 19,\
   .clk = 18,\
-  .dio0 = -1,\
-  .dio1 = -1,\
-  .dio2 = -1,\
-  .nss = -1,\
-  .reset = -1,\
+  .dio0 = 5,\
+  .dio1 = 12,\
+  .dio2 = 13,\
+  .nss = 15,\
+  .reset = 4,\
   .spi_host = 1,\
 }
 
-enum freq {
-  F433, F866, F915
-} lora32_freq;
-
 typedef enum {
   B78, B104, B156, B208, B3125, B417, B625, B125, B250, B500
 } bandwidth;