mail: Fix email address

Fix my email address.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Tom Rini <trini@ti.com>

doc/git-mailrc

@@ -22,7 +22,7 @@ alias jasonjin       Jason Jin <jason.jin@freescale.com>
 alias jhersh         Joe Hershberger <joe.hershberger@gmail.com>
 alias kimphill       Kim Phillips <kim.phillips@freescale.com>
 alias macpaul        Macpaul Lin <macpaul@andestech.com>
-alias marex          Marek Vasut <marek.vasut@gmail.com>
+alias marex          Marek Vasut <marex@denx.de>
 alias monstr         Michal Simek <monstr@monstr.eu>
 alias panto          Pantelis Antoniou <panto@antoniou-consulting.com>
 alias prafulla       Prafulla Wadaskar <prafulla@marvell.com>