.mailmap: add entry for Leonard Göhrs

My very first kernel commit:

  e4e1d47c ("ALSA: ppc: remove redundant checks in PS3 driver probe")

was sent with the umlaut in my last name transcribed (Göhrs -> Goehrs).

Add a mailmap entry so all my commits use the same name.

Link: https://lkml.kernel.org/r/20230321145525.1317230-1-l.goehrs@pengutronix.deSigned-off-by: Leonard Göhrs <l.goehrs@pengutronix.de>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

.mailmap

@@ -266,6 +266,7 @@ Krzysztof Kozlowski <krzk@kernel.org> <krzysztof.kozlowski@canonical.com>
 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
 Kuogee Hsieh <quic_khsieh@quicinc.com> <khsieh@codeaurora.org>
 Leonardo Bras <leobras.c@gmail.com> <leonardo@linux.ibm.com>
+Leonard Göhrs <l.goehrs@pengutronix.de>
 Leonid I Ananiev <leonid.i.ananiev@intel.com>
 Leon Romanovsky <leon@kernel.org> <leon@leon.nu>
 Leon Romanovsky <leon@kernel.org> <leonro@mellanox.com>