fs_mgr: change the log level in fs_mgr_read_fstab_dt()

Devices having no early mount enabled won't have fstab in device tree.
Lower the log level to INFO when fstab is absent there.

Bug: 35811655
Test: boot into recovery mode in a device without fstab in dt
Change-Id: I4b1e0e6554f50b8118770d00aa8f54be86aca858
1 file changed