AirSpy Firmware version v1.0.0-rc8

Modifications for rc8:

• Add support of TCXO calibration for AirSpy NOS R0/R2 and AirSpy Mini
• Add new command usb_vendor_request_erase_sector_spiflash in order to erase sector 2 to 13 as sector 0 & 1 are reserved (each sector is 64KB)
• Add spiflash w25q80bv_read function (now we can read spiflash before we was reading internal memory)

Note:
- This firmware support 10MSPS & experimental 2.5MSPS for AirSpy NOS R0/R2
- This firmware support 6MSPS & 3MSPS for AirSpy Mini

• MD5 for https://github.com/airspy/firmware/releases/tag/v1.0.0-rc8 (build on 2016-06-06):
  md5sum airspy_fw/airspy_rom_to_ram/airspy_rom_to_ram.bin
631e06d999aa9937d1c8d9cdaabc36e8 *airspy_fw/airspy_rom_to_ram/airspy_rom_to_ram.bin
airspy_fw/airspy_rom_to_ram/airspy_rom_to_ram.bin Size 21 380 bytes
• To flash the latest firmware in attachment airspy_fw_v1.0.0-rc8.zip
• For Windows:
  • 1. Extract the archive
  • 2. Connect AirSpy with USB to your computer
  • 3. Launch airspy_spiflash.bat from extracted archive directory
  • 4. Disconnect AirSpy from USB computer
  • 5. Connect AirSpy with USB to your computer, now you can use your favorite software