pine64-rockpro64: Initial firmware package, AP6359SA

The AP6359SA is a BCM4359 SDIO-based Wi-Fi/Bluetooth module that Pine64 sells specifically for the RockPro64 device. This commit starts a firmware package to support it specifically, while others can later add firmware for other modules sold for the device.

I was unable to find a suitable license for the firmware blobs, so until we find a suitable repository containing all of the required files by the module with a license included, or contact the vendor directly, let's use LibreELEC's repository without a license for now.