Bypass FUSE restrictions if any app requests legacy

When we launch R, we will only respect the legacy flag on apps
targetting <= Q. Imposing this restriction now before fixing
b/142395442 makes CTS fail.

We will eventually add an adb install flag to force install an
app in legacy storage even on R. And use that check instead of
granting any requestor legacy storage.

Test: ExternalStorageHostTest#testMediaSandboxedFull passes with FUSE
Bug: 137755945
Bug: 142395442
Change-Id: I6235b3083acce1f77de11f28b630e93c45600113
1 file changed