[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: I2b0eeecb680c33792063b9fb5e932d46d98d0d4e
Change-Id: I2b0eeecb680c33792063b9fb5e932d46d98d0d4e
(cherry picked from commit b30a72dd2d492ad66f4bdf0c0f15884a1ba194aa)
1 file changed