Always write makefile for ${TARGET_RELEASE}

When writing all makefiles, we also need to write the makefile for
${TARGET_RELEASE}.  We can skip writing it a second time if it is not
an alias.

Bug: 328495189
Test: manual, TH
Ignore-AOSP-First: cherry-pick
Merged-In: Ia5d1955f419312c76eb9c8a33b1c8a6bcc5efe0b
Change-Id: Ia5d1955f419312c76eb9c8a33b1c8a6bcc5efe0b