.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>
diff --git a/.gitignore b/.gitignore
index 2fb1765..d263ca9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -130,7 +130,12 @@
 x509.genkey
 
 # Kconfig presets
-all.config
+/all.config
+/alldef.config
+/allmod.config
+/allno.config
+/allrandom.config
+/allyes.config
 
 # Kdevelop4
 *.kdev4