Draft: testing/linux-postmarketos-qcom-msm8974: enable wifi for sony-leo

Get brcmfmac4339-sdio.sony,xperia-leo.bin and brcmfmac4339-sdio.txt from https://github.com/FairBlobs/leo-firmware and place in /lib/firmware/brcm/

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Not really for merging, more just for testing right now.