Integrate gen_notice with Make for dist.

Most exempt module types have no output. Support exempt module types
with output by requiring they must be 0p and have no license metadata.

Disallow `licenses: []` property on gen_notice.

Test: m cts dist

Change-Id: Ic992bd6420fa6898495866eac43495002ef4b6c8
Merged-in: Ic992bd6420fa6898495866eac43495002ef4b6c8