oss: remove maui_boot.h from .gitignore and dontdiff

Commit d56b9b9c ("The scheduled removal
of some OSS drivers") removed all traces of maui_boot.h from the tree.
Remove its entries in dontdiff and oss's .gitignore file.
Signed-off-by: NPaul Bolle <pebolle@tiscali.nl>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

Documentation/dontdiff

@@ -163,7 +163,6 @@ mach-types.h
 machtypes.h
 map
 map_hugetlb
-maui_boot.h
 media
 mconf
 miboot*

sound/oss/.gitignore

 #Ignore generated files
-maui_boot.h
 pss_boot.h
 trix_boot.h