core: Let the build specify mount options for recovery

Currently recovery install/patch will mount /system++ with only default
The default options are not very suitable for dealing with crashes.
We now use
that can specify which mount options to use for a given fs-type.
  # <fstype>=<fstype_opts>[|<fstype_opts>]...
  # fstype_opts := <opt>[,<opt>]...
  #         opt := <name>[=<value>]
If only defaults are to be used, then the can just have
an empty (must have ""):

The default is

The release tools will pick them up with

Bug: 18092222
Change-Id: Iaa59099b0edf5af8835d1862fada089cff58882c
1 file changed