Fix for Apple Magic Keyboard A1644

The keyboard has boot keyboard on interface 1, not 0.
hidboot.h did not support device like that.
tmk/tmk_keyboard#606 (comment)
USB Descriptor: https://gist.github.com/tmk/0626b78f73575d5c1efa86470c4cdb18

hidboot.h

@@ -202,6 +202,7 @@ class HIDBoot : public USBHID //public USBDeviceConfig, public UsbConfigXtracter
 {
  EpInfo epInfo[totalEndpoints(BOOT_PROTOCOL)];
  HIDReportParser *pRptParser[epMUL(BOOT_PROTOCOL)];
+ uint8_t bootIf[epMUL(BOOT_PROTOCOL)]; // interface number of boot endpoint
 
  uint8_t bConfNum; // configuration number
  uint8_t bIfaceNum; // Interface Number
@@ -462,19 +463,19 @@ uint8_t HIDBoot<BOOT_PROTOCOL>::Init(uint8_t parent, uint8_t port, bool lowspeed
 
  // Yes, mouse wants SetProtocol and SetIdle too!
  for(uint8_t i = 0; i < epMUL(BOOT_PROTOCOL); i++) {
- USBTRACE2("\r\nInterface:", i);
+ USBTRACE2("\r\nInterface:", bootIf[i]);
 
- rcode = SetProtocol(i, bRptProtoEnable ? HID_RPT_PROTOCOL : USB_HID_BOOT_PROTOCOL);
+ rcode = SetProtocol(bootIf[i], bRptProtoEnable ? HID_RPT_PROTOCOL : USB_HID_BOOT_PROTOCOL);
  USBTRACE2("SET_PROTOCOL: ", rcode);
  if (rcode && rcode != hrSTALL) goto Fail;
 
- rcode = SetIdle(i, 0, 0);
+ rcode = SetIdle(bootIf[i], 0, 0);
  USBTRACE2("SET_IDLE: ", rcode);
  if (rcode && rcode != hrSTALL) goto Fail;
 
  // Get the RPIPE and just throw it away.
  SinkParser<USBReadParser, uint16_t, uint16_t> sink;
- rcode = GetReportDescr(i, &sink);
+ rcode = GetReportDescr(bootIf[i], &sink);
  USBTRACE2("RPIPE: ", rcode);
  }
 
@@ -551,6 +552,7 @@ void HIDBoot<BOOT_PROTOCOL>::EndpointXtract(uint8_t conf, uint8_t iface, uint8_t
  epInfo[bNumEP].bmSndToggle = 0;
  epInfo[bNumEP].bmRcvToggle = 0;
  epInfo[bNumEP].bmNakPower = USB_NAK_NOWAIT;
+ bootIf[bNumEP - 1] = iface;
  bNumEP++;
 
  }