mailmap: Update mail address

Update my email address from gmail to my domain.

Signed-off-by: Ricardo Ribalda Delgado <ricardo@ribalda.com>

.mailmap

@@ -31,8 +31,8 @@ Markus Klotzbuecher <mk@denx.de>
 Paul Burton <paul.burton@mips.com> <paul.burton@imgtec.com>
 Prabhakar Kushwaha <prabhakar@freescale.com>
 Rajeshwari Shinde <rajeshwari.s@samsung.com>
-Ricardo Ribalda <ricardo.ribalda@uam.es>
-Ricardo Ribalda <ricardo.ribalda@gmail.com>
+Ricardo Ribalda <ricardo@ribalda.com> <ricardo.ribalda@uam.es>
+Ricardo Ribalda <ricardo@ribalda.com> <ricardo.ribalda@gmail.com>
 Sandeep Paulraj <s-paulraj@ti.com>
 Shaohui Xie <Shaohui.Xie@freescale.com>
 Stefan Roese <stroese>