.travis.yml: Fix incorrect usage of -j option

xtensa-build-all.sh expects number of cores to be used when -j option is
specified. By default, it uses all the cores available which is what we
want, hence, omitting the option altogether.

Signed-off-by: Shreeya Patel <shreeya.patel23498@gmail.com>

Author: crazoes

.travis.yml

@@ -29,7 +29,7 @@ jobs:
         &docker-pull-sof
         docker pull thesofproject/sof && docker tag thesofproject/sof sof
       script:
-        ./scripts/docker-run.sh ./scripts/xtensa-build-all.sh -j $PLATFORM
+        ./scripts/docker-run.sh ./scripts/xtensa-build-all.sh $PLATFORM
       env: PLATFORM='sue'
 
     - <<: *build-platform
@@ -50,7 +50,7 @@ jobs:
       stage: tests
       script:
         - sed -i $(($(grep "config HAVE_AGENT" -n src/platform/Kconfig | cut -f1 -d:)+2))"s/default y/default n/" src/platform/Kconfig
-        - ./scripts/docker-run.sh ./scripts/xtensa-build-all.sh -r -j $PLATFORM
+        - ./scripts/docker-run.sh ./scripts/xtensa-build-all.sh -r $PLATFORM
         - ./scripts/docker-qemu.sh ../sof.git/scripts/qemu-check.sh $PLATFORM
       env: PLATFORM='byt cht'
       before_install: