Fix crash when DocumentsProviders using duplicate authority exist

Files app crashes when loading roots if it failed to get provider info
from authority. This could be happen in case there're different
DocumentsProviders using the same authority.

Bug: 72474325
Test: Manual
Test: Run instrumentation tests from com.android.documentsui.tests
Change-Id: I17443f6cb00e7e784384166bd807c7065d5ee61b
(cherry picked from commit b0087a45b34823b65bee5afe879a1643acdc8fa4)