Makefile: added -gnu to EXTRAVERSION
README: added blurb about GNU Linux-libre
include/linux/firmware.h: added non-Free firmware notification support
include/linux/ihex.h: added non-Free ihex firmware notification support

MICROCODE_AMD - AMD microcode patch loading support
arch/x86/kernel/cpu/microcode/amd.c: disabled non-Free firmware-loading machinery
arch/x86/kernel/cpu/microcode/amd.c: removed blobs

MICROCODE_AMD_EARLY - Early load AMD microcode
arch/x86/kernel/cpu/microcode/amd_early.c: removed blobs