Fix failing drm 1.0 vts tests

The shared library path was incorrectly set based on
the drm.64bit.enabled flag. It should be set based
on whether the drm service is running as 32-bit or
64-bit.

Test: vts-tradefed run commandAndExit vts -m VtsHalDrmV1_0Target

bug:111289939
Change-Id: I388dc87bd4566211dc2901feccf1e6e1c90bfe67