Update cypress/brcm firmware for Pi
@ncopa Following recent fix from Cypress to improve wifi/BT coexitence on Pi, it turns-out Alpine's brcmfmac43455-sdio within linux-firmware package is slightly outdated.
One might want to line-up 43455/43430 with RPi-Distro versions which naturally get the most current tweaks including NVRAM configuration file. (Bluetooth .hcd firmware files seem already linked to RPi-Distro)