treewide: Fix Marek's name and change my e-mail address

Fix diacritics in some instances of my name and change my e-mail address
to kabel@kernel.org.

Add corresponding .mailmap entries.

Signed-off-by: Marek BehĂșn <kabel@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/fs/fs_internal.c b/fs/fs_internal.c
index bfc35c9..ae1cb85 100644
--- a/fs/fs_internal.c
+++ b/fs/fs_internal.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
- * 2017 by Marek Behun <marek.behun@nic.cz>
+ * 2017 by Marek Behún <kabel@kernel.org>
  *
  * Derived from code in ext4/dev.c, which was based on reiserfs/dev.c
  */