Create ODM partition NOTICE file

Logic to create a seperate ODM NOTICE file for modules located at
TARGET_OUT_ODM.

Bug: 137542307
Test: Built an image with both a seperate ODM image and one where it is
built into vendor.img and ensured that a NOTICE.xml.gz was located at
/odm/etc and contained any license generated by ODM modules.

Change-Id: I9e6f46b1b94c5b6584c2a5810713fcf49f637d02