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/arch/arm/mach-mvebu/include/mach/mbox.h b/arch/arm/mach-mvebu/include/mach/mbox.h
index f1cb55f..fcc7a46 100644
--- a/arch/arm/mach-mvebu/include/mach/mbox.h
+++ b/arch/arm/mach-mvebu/include/mach/mbox.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0+ */
 /*
- * Copyright (C) 2018 Marek Behun <marek.behun@nic.cz>
+ * Copyright (C) 2018 Marek Behún <kabel@kernel.org>
  * Copyright (C) 2021 Pali Rohár <pali@kernel.org>
  */