of: Add missing exports of node name compare functions

[ Upstream commit 173ee3962959a1985a109f81539a403b5cd07ae7 ]

Commit f42b0e18 ("of: add node name compare helper functions")
failed to add the module exports to of_node_name_eq() and
of_node_name_prefix(). Add them now.

Fixes: f42b0e18 ("of: add node name compare helper functions")
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>