Set file permission to be executable.

When ramdisk-image-create is called with the hwdiscovery element,
it failed to install hwinfo package.

The root reason is 10-hwinfo is not executable, the fix is to
set the file permission of 10-hwinfo to be executable.

Change-Id: I3a57147103f607b3975eb6ad23a44475f26c2f1e