[automerger skipped] Merge "soong config: add value_variable substitution" into rvc-dev am: a59774eb am: 78c7ba79 -s ours
am skip reason: Change-Id I18f35746b5cc39c304a136980249e886d38c6df6 with SHA-1 b0935db8 is in history
Change-Id: Id0e10f9329788c3a7fe0769e202e0e65c52cbb4d