Add erofs to supported fs type

Since erofs image has been supported, we should add erofs to supported
fs type so that it can be mounted in recovery mode.

Bug:174816929
Test: mount erofs image in recovery on cuttlefish
Signed-off-by: Huang Jianan <huangjianan@oppo.com>
Change-Id: I4199ff87acfc179a2b83d98b1675fc898144878b