A wrong permission mode causes ActsAppdatamagrJsTest ACTS test suite to 
fail because it fails to open /dev/ashmem due to a "Permission denied" error. 
Changing permission to /dev/ashmem: "chmod 666 /dev/ashmem" because 
it needs to be rw for all users.

Signed-off-by: Francesco Pham <francesco.pham@huawei.com>