ch552: Misc. cleanup

- Merge Makefile and Makefile.include into Makefile
  - Format structure
  - Remove unused variables, targets etc.

- Add missing check if it is ok to send data to the FPGA.

- Remove 'baud rate calculator.ods'

- Update encode_usb_strings.py to generate strings for
  CdcCtrlInterfaceDesc, CdcDataInterfaceDesc,
  FidoHidInterfaceDesc, TkeyCtrlInterfaceDesc.
  Also store generated strings in UTF-16 instead of hex.

- Update usb_strings.h to match new encode_usb_strings.py
  output.

- Remove unused struct SetupReqBuf.

hw/usb_interface/ch552_fw/include/debug.h

@@ -186,6 +186,8 @@ inline uint8_t  CH554UART1RcvByte( )
  *******************************************************************************/
 inline void CH554UART1SendByte(uint8_t SendDat)
 {
+    while(gpio_p1_4_get() == 0)
+        ;
     SBUF1 = SendDat; // Query sending, the interrupt mode does not need the following two statements, but TI=0 is required before sending
     while (U1TI == 0)
         ;