Move boot media to /media/realroot for easy access after boot.

There are cases where software after boot may need to know the
current boot disk.  Under the current system, it is not guaranteed
which disk is the boot.  While /media/sda is a good guess, it
isn't always right, nor is it a good assumption that only one boot
disk is in the system.  This gives a standard path to the original
boot disk mount which can be used to, for instance, update the
syslinux file on the boot media with a newer kernel, or updating
the boot parameters to add user options for future boots.  Knowing
which disk is the boot media keeps from updating the non-boot
disk when for instance multiple syslinux boot medias are plugged in
(ie ensure correct syslinux is updated when the booted system is
updated).

Signed-off-by: Brian Lloyd <blloyd@familyhonor.net>
Signed-off-by: Saul Wold <sgw@linux.intel.com>

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