mailmap: Update mail address (lukma)

Update my e-mail address from samsung.com to denx.de

Signed-off-by: Lukasz Majewski <lukma@denx.de>
diff --git a/.mailmap b/.mailmap
index d297030..1bee048 100644
--- a/.mailmap
+++ b/.mailmap
@@ -34,4 +34,5 @@
 York Sun <yorksun@freescale.com>
 York Sun <york.sun@nxp.com>
 Ɓukasz Majewski <l.majewski@samsung.com>
+Lukasz Majewski <lukma@denx.de>
 Mirza <Taimoor_Mirza@mentor.com>