use the binary, not the source package for tegra3 drivers

debian/changelog

@@ -1,3 +1,9 @@
+livecd-rootfs (2.98) UNRELEASED; urgency=low
+
+  * we want nvidia-tegra3 (the binary) not nvidia-graphics-drivers-tegra3
+
+ -- Oliver Grawert <ogra@ubuntu.com>  Mon, 19 Nov 2012 14:55:19 +0100
+
 livecd-rootfs (2.97) raring; urgency=low
 
   * add linux-firmware-nexus7 and nvidia-graphics-drivers-tegra3 to nexus7

live-build/auto/config

@@ -308,7 +308,7 @@ case $ARCH in
 				;;
 			nexus7)
 				COMPONENTS='main restricted universe multiverse'
-				add_package install zram-config linux-firmware-nexus7 nvidia-graphics-drivers-tegra3
+				add_package install zram-config linux-firmware-nexus7 nvidia-tegra3
 				add_package live ac100-tarball-installer
 				BINARY_REMOVE_LINUX=false
 				mkdir -p config/preseed