Makefile: Add targets to add and remove symlinks

When "make symlink" is run, it looks for symlink.txt files recursively
under site-local directory, and make symbolic links accordingly.

"make clean-symlink" removes the symbolic links made.

One application is for development of support for new processors and/or
new mainboards, where new directories are added, along with some common
code changes.

Change-Id: I3fa119675ecca1626d70375a61e8a71abec6a53b
Signed-off-by: Christian Walter <christian.walter@9elements.com>
Signed-off-by: Jonathan Zhang <jonzhang@meta.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/65093
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin L Roth <gaumless@gmail.com>

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