Add ART_MODULE_BUILD_FROM_SOURCE to control the equivalent soong config variable

When product configuration is converted to Starlark, soong config variables
will be stored in a dictionary and won't be able to be specified directly
on the command line. Add a regular variable that controls the soong config
variable.

Bug: 220940864
Test: Presubmits
Change-Id: Icb6b0c33ea6826ebd8c2ce615dc643eedb9c35a3