Sync the missing operations on modem efs files with the seperated fstab.
Bug: 359426567
Flag: EXEMPT bugfix
Change-Id: Ib678adc86c36a536ed32861e93d1d973e2c7c34a
The efs read/write partitions will be part of the fstab.rw.efs
file and will have their own RC file to mount them.
This change allows us to identify the different partitions and
their types. It will also make easier to select different
RC files depending on the page size.
Bug: 356425337
Test: $ source build/envsetup.sh
$ lunch [zumapro]-trunk_staging-userdebug
$ m
$ ./vendor/google/tools/flashall -w
Flag: EXEMPT bugfix
Change-Id: I3eb877ecc3ccf435110ee0da4a949b44729b3bdb
