.gitignore: add more all*.config patterns

For completeness, ignore all the allconfig variants.

I added a leading slash because they are only searched in the
top of the tree.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

.gitignore

@@ -130,7 +130,12 @@ signing_key.x509
 x509.genkey
 
 # Kconfig presets
-all.config
+/all.config
+/alldef.config
+/allmod.config
+/allno.config
+/allrandom.config
+/allyes.config
 
 # Kdevelop4
 *.kdev4