[NFC] Move MTE mode settings to a product variable.

The default list of memtag targets found in
  build/make/target/product/memtag-common.mk

Bug: 280343521
Test: no functional change
Merged-In: I2160b2386917ba1a2afde1ee5c335233dd5e05ac
Change-Id: I2160b2386917ba1a2afde1ee5c335233dd5e05ac
(cherry picked from commit e073622c26baab60a0691f833c361988a122df26)
3 files changed