MAINTAINERS: update my email address

Update my email-address in MAINTAINERS to <david@readahead.eu>. Also add
.mailmap entries to map my old surname and email-addresses.
Signed-off-by: David Rheinsberg <david@readahead.eu>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

.mailmap

@@ -119,6 +119,9 @@ Daniel Borkmann <daniel@iogearbox.net> <dborkmann@redhat.com>
 Daniel Borkmann <daniel@iogearbox.net> <dborkman@redhat.com>
 Daniel Borkmann <daniel@iogearbox.net> <dxchgb@gmail.com>
 David Brownell <david-b@pacbell.net>
+David Rheinsberg <david@readahead.eu> <dh.herrmann@gmail.com>
+David Rheinsberg <david@readahead.eu> <dh.herrmann@googlemail.com>
+David Rheinsberg <david@readahead.eu> <david.rheinsberg@gmail.com>
 David Woodhouse <dwmw2@shinybook.infradead.org>
 Dengcheng Zhu <dzhu@wavecomp.com> <dczhu@mips.com>
 Dengcheng Zhu <dzhu@wavecomp.com> <dengcheng.zhu@gmail.com>

MAINTAINERS

@@ -21778,7 +21778,7 @@ F:	Documentation/admin-guide/ufs.rst
 F:	fs/ufs/
 
 UHID USERSPACE HID IO DRIVER
-M:	David Rheinsberg <david.rheinsberg@gmail.com>
+M:	David Rheinsberg <david@readahead.eu>
 L:	linux-input@vger.kernel.org
 S:	Maintained
 F:	drivers/hid/uhid.c
@@ -22902,7 +22902,7 @@ S:	Maintained
 F:	drivers/rtc/rtc-sd3078.c
 
 WIIMOTE HID DRIVER
-M:	David Rheinsberg <david.rheinsberg@gmail.com>
+M:	David Rheinsberg <david@readahead.eu>
 L:	linux-input@vger.kernel.org
 S:	Maintained
 F:	drivers/hid/hid-wiimote*