Documentation: add makefiles for more targets

Add a bunch of previously unbuilt source files to the Documentation build
machinery.

Signed-off-by: Peter Foley <pefoley2@pefoley.com>
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/Documentation/arm/Makefile b/Documentation/arm/Makefile
new file mode 100644
index 0000000..732c770
--- /dev/null
+++ b/Documentation/arm/Makefile
@@ -0,0 +1 @@
+subdir-y := SH-Mobile