vts_treble_vintf_test: requires target fcm version for O-MR1+ devices.

For devices with board API level >= O-MR1, the target FCM version
must be set.

It is already required by assemble_vintf at build time.
Devices could, in theory, copy
manifest files without going through assemble_vintf to bypass
the check at build time, though the
check-product-copy-files procedure in build/core/Makefile already
prevents copying VINTF metadata directly.

Given all these checks above, the requirement is already enforced
in a way. This change explicitly test for the requirement.

Fixes: 265199735
Test: TH

Change-Id: Id277b7ef58d2e02b4b5450add0920e56b4abb5c2
1 file changed