shamu: remove discard in fstab

Bug: 30807864
Change-Id: If3f67d5b7b15409c2717ef0d92851ca46677e4ff
(cherry picked from commit 6f71c79014279ef8f2e12898b8a07ae8c3ebd339)
(cherry picked from commit a02879f0e7186f62bd82acad4ba7265403a6991c)
1 file changed