.travis.yml: remove 824x builds

remove powerpc 824x build, as this architecture not longer
exists.
Signed-off-by: NHeiko Schocher <hs@denx.de>

.travis.yml

@@ -106,9 +106,6 @@ matrix:
     - env:
         - 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"