MAINTAINERS: tegra: Remove self as maintainer

I have not been doing any Tegra maintainance work for a while, and this
is unlikely to change in the foreseeable future. Better reflect the
actual state of things by removing myself from the list.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

MAINTAINERS

@@ -12303,7 +12303,6 @@ F:	drivers/media/rc/ttusbir.c
 
 TEGRA ARCHITECTURE SUPPORT
 M:	Thierry Reding <thierry.reding@gmail.com>
-M:	Alexandre Courbot <gnurou@gmail.com>
 M:	Jonathan Hunter <jonathanh@nvidia.com>
 L:	linux-tegra@vger.kernel.org
 Q:	http://patchwork.ozlabs.org/project/linux-tegra/list/