brcm63xx-arm: Update fake "bcmlinux" Linux kernel for 5.04L.02p1

Andreas Gnaurequested to merge
agnau-bcmlinux-update into devel

This kernel is only used for userspace headers. The kernel from the Broadcom SDK build system is the one ending up in the final image.

Also change to a fixed commit instead of a branch.

Signed-off-by: Andreas Gnau andreas.gnau@iopsys.eu

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