tools: remove unused travis yml

now we have uplever travis.yml to cover the tools test, the tools level
file is not needed.

Signed-off-by: Pan Xiuli <xiuli.pan@linux.intel.com>

tools/.travis.yml

@@ -1,14 +0,0 @@
-sudo: required
-
-language: c
-
-services:
-  - docker
-
-before_install:
-  - docker pull xiulipan/sof
-  - echo -e '#!/bin/bash \n./autogen.sh && ./configure && make && make tests 1>/dev/null' > quickbuild.sh
-  - chmod 755 quickbuild.sh
-
-script:
-  - docker run -it -v `pwd`:/home/sof/work/sof.git --user `id -u` xiulipan/sof ./quickbuild.sh