dt-bindings: don't anchor DT_SCHEMA_FILES to bindings directory

Commit 5e3ef45 ("dt-bindings: ignore paths outside kernel for
DT_SCHEMA_FILES") anchored all searches to the bindings directory
(since bindings only exist below that), but it turns out this is not
always desired.

Just anchor to the base kernel source directory and while at it, break
the overly long line for legibility.

Reported-by: Michal Simek <[email protected]>
Fixes: 5e3ef45 ("dt-bindings: ignore paths outside kernel for DT_SCHEMA_FILES")
Closes: https://lore.kernel.org/all/[email protected]/
Cc: Masahiro Yamada <[email protected]>
Signed-off-by: André Draszik <[email protected]>
Tested-by: Michal Simek <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Rob Herring <[email protected]>

Author: andred

Documentation/devicetree/bindings/Makefile

@@ -28,7 +28,10 @@ $(obj)/%.example.dts: $(src)/%.yaml check_dtschema_version FORCE
 find_all_cmd = find $(srctree)/$(src) \( -name '*.yaml' ! \
 		-name 'processed-schema*' \)
 
-find_cmd = $(find_all_cmd) | sed 's|^$(srctree)/$(src)/||' | grep -F -e "$(subst :," -e ",$(DT_SCHEMA_FILES))" | sed 's|^|$(srctree)/$(src)/|'
+find_cmd = $(find_all_cmd) | \
+		sed 's|^$(srctree)/||' | \
+		grep -F -e "$(subst :," -e ",$(DT_SCHEMA_FILES))" | \
+		sed 's|^|$(srctree)/|'
 CHK_DT_DOCS := $(shell $(find_cmd))
 
 quiet_cmd_yamllint = LINT    $(src)