misc: fs-loader: Use fw_storage_interface instead of storage_interface

The fs-loader driver reads env storage_interface and uses it to load
firmware file into memory using the medium set by env. Update the driver
to use env fw_storage_interface as this variable is only used to load
firmwares. This is to keep all variables used by fs-loader driver with
'fw_' prefix. All other variables have 'fw_' prefix except for
storage_interface.

The env storage_interface will act as fallback so that the
existing implementations do not break.

Also update the FS Loader documentation accordingly.

Signed-off-by: MD Danish Anwar <danishanwar@ti.com>

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