Remove fs utilities from init_boot module list

These modules aren't actually marked with "ramdisk_avaible: true",
so including them in the generic ramdisk module list don't do anything.
In addition, the generic ramdisk won't have enough space to store
all these modules, because each static executable would be 1MB in size, and init_boot is only 8MB.

Test: th
Change-Id: I589a43ca07d25ffc03a7b72516b329404a92d694