bcmkernel: bcm_git: Workaround version check bug in 5.04L.04test2/3

The version file in the main BCM SDK 5.04L.04test2 has a newline at the beginning while the version check in the voice-addon compares it against a file without a newline, which will lead to additional prompts. Work around this by patching the bcmvoiceinstall installation script to ignore blank lines in the bcm_git.sh script, but only if the version is 5.04L.04test2.