gitignore: add all.config

This is used by kbuild to load preset Kconfig options.  We need to
ignore it, otherwise git clean kills it.

Signed-off-by: Borislav Petkov <[email protected]>
Cc: Michal Marek <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Author: suryasaimadhu

.gitignore

@@ -92,3 +92,6 @@ extra_certificates
 signing_key.priv
 signing_key.x509
 x509.genkey
+
+# Kconfig presets
+all.config