Update LED_BUILTIN pin for LOLIN32 (espressif#362)

* Add ESP.getChipId() function to get ESP32's ChipID.

* change getChipId() to getEfuseMac()

* * Change board:Lolin32 to LOLIN32
* Update LED_BUILTIN pin for LOLIN32

Author: wemos

boards.txt

@@ -181,7 +181,7 @@ nano32.menu.UploadSpeed.512000.upload.speed=512000
 
 ##############################################################
 
-lolin32.name=WEMOS LoLin32
+lolin32.name=WEMOS LOLIN32
 
 lolin32.upload.tool=esptool
 lolin32.upload.maximum_size=1044464
@@ -194,7 +194,7 @@ lolin32.serial.disableRTS=true
 lolin32.build.mcu=esp32
 lolin32.build.core=esp32
 lolin32.build.variant=lolin32
-lolin32.build.board=LoLin32
+lolin32.build.board=LOLIN32
 
 lolin32.build.f_cpu=240000000L
 lolin32.build.flash_mode=dio

variants/lolin32/pins_arduino.h

@@ -11,10 +11,10 @@
 #define digitalPinToInterrupt(p)    (((p)<40)?(p):-1)
 #define digitalPinHasPWM(p)         (p < 34)
 
-static const uint8_t LED_BUILTIN = 2;
+static const uint8_t LED_BUILTIN = 5;
 #define BUILTIN_LED  LED_BUILTIN // backward compatibility
 
-static const uint8_t KEY_BUILTIN = 0;
+
 
 static const uint8_t TX = 1;
 static const uint8_t RX = 3;