.travis.yml: remove 824x builds

remove powerpc 824x build, as this architecture not longer
exists.

Signed-off-by: Heiko Schocher <hs@denx.de>
diff --git a/.travis.yml b/.travis.yml
index 90f0fd7..923c9dd 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -107,9 +107,6 @@
         - TEST_CMD="tools/buildman/buildman mpc512x"
           INSTALL_TOOLCHAIN="ppc"
     - env:
-        - TEST_CMD="tools/buildman/buildman mpc824x"
-          INSTALL_TOOLCHAIN="ppc"
-    - env:
         - TEST_CMD="tools/buildman/buildman mpc8260"
           INSTALL_TOOLCHAIN="ppc"
     - env: