cypress-firmware: use symlink to provide firmware in brcm
This is to align the implementation with upstream `linux-firmware`.
Instead of moving these firmware files to `brcm` subdirectory and changing
their names, leave them in `cypress` subdirectory, keep their names intact
and use symbolic links to provide compatibility with Broadcom FullMAC
driver.
This gives more context to where the firmware comes from.
projects / thirdparty / openwrt.git / commit
