MTP: Sanitize filename provided from MTP host

Fix potential security vulnerability via MTP path traversal

Bug: 130656917
Test: atest frameworks/av/media/mtp/tests
Test: Manual test: modified libmtp for path traversal attack
Test: Manual test: normal recursive folder copy
Note: Also patched with 68ccf5c4 (b/135764253)
Change-Id: I467e1e6a76d09951050f7f45e5a63419e540c572
(cherry picked from commit e783e4b2)
Merged-In: I467e1e6a76d09951050f7f45e5a63419e540c572