GfA/linux_kernel: linux kernel based on RobertCNelsons patchset https://github.com/RobertCNelson/bb-kernel

Max Filippov f8f02ca73c xtensa: build kernel with text-section-literals		%!s(int64=7) %!d(string=hai) anos
..
Makefile	9a736fcb09 xtensa: clean up bootable image build targets	%!s(int64=8) %!d(string=hai) anos
boot.ld	a078ccff56 xtensa: fix redboot load address	%!s(int64=12) %!d(string=hai) anos
bootstrap.S	f8f02ca73c xtensa: build kernel with text-section-literals	%!s(int64=7) %!d(string=hai) anos