When the dt-bindings Makefile searches for schema files, it uses "find"
to search for yaml files. Find does not travese past symlinks, but
bindings is a symlink to the devicetree project. Force traversal by
adding trailing slash so that the root directory is past the symlink.
Change-Id: I9575b3b9e00725c5e1bcaccf99070d71994a9f77
Signed-off-by: Elliot Berman <quic_eberman@quicinc.com>