vndk-snapshot: Make the remote name settable

To check license, we need to fetch revision from parent git
repository. Using '--remote' option we may manually set the remote
name. Default value is 'aosp'.

Test: run update.py to fetch vndk snapshot files.
Change-Id: I1456eb4306950da3d25ec2b4d9fc4efc4b5bcd81
2 files changed