Travis-CI: Update PATH

We now can no longer re-use the provided path and need to give the
full PATH we want used now.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/.travis.yml b/.travis.yml
index ea560b9..4b7f8dd 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -52,7 +52,7 @@
 
 env:
   global:
-    - PATH=/tmp/dtc:/tmp/qemu-install/bin:/tmp/uboot-test-hooks/bin:$PATH
+    - PATH=/tmp/dtc:/tmp/qemu-install/bin:/tmp/uboot-test-hooks/bin:/usr/bin:/bin
     - PYTHONPATH=/tmp/uboot-test-hooks/py/travis-ci
     - BUILD_DIR=build
     - HOSTCC="cc"