pw_protobuf_compiler: Fix dependency bug
pw_protobuf_compiler: Fix dependency bug

This change fixes an issue in the proto build code where proto
dependencies were not being set for all generators.

Change-Id: Iaac38845480705c2f79d0d6280ff4e240e1feba7

google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed