The BIS storage interface is now initialized by utilsInitializeResources() via bisStorageInitialize(). It takes care of mounting all eMMC FAT partitions in read-only mode, making it possible for the rest of the code to interact with them at any time without having to manually mount them beforehand.
Other changes include:
* bis_storage: add bisStorageExit().
* bis_storage: add bisStorageGetGptPartitionNameByBisPartitionId(), bisStorageGetSystemInitializerPartitionNameByBisPartitionId() and bisStorageGetMountNameByBisPartitionId() helpers.
* bis_storage: change bisStorageMountPartition(), bisStorageUnmountPartition() and bisStorageUnmountAllPartitions() to static functions.
* bis_storage: mount FAT partitions with FatFs by using drive numbers instead of arbitrary strings.
* cert: update code to reflect BIS storage interface changes.
* defines: add BIS_FAT_PARTITION_COUNT macro.
* fatfs/ffconf: use BIS_FAT_PARTITION_COUNT macro as the value for the FF_VOLUMES macro.
* fatfs/ffconf: disable arbitrary string support for volume IDs.
* nxdt_devoptab: increase concurrent mounted device count to 8.
* nxdt_utils: add missing underscores to anonymous variables in SCOPED_LOCK and SCOPED_TRY_LOCK macros.
* nxdt_utils: take care of BIS storage interface (de)initialization.
* poc: update code to reflect BIS storage interface changes.
* tik: update code to reflect BIS storage interface changes.
Takes care of retrieving a FsStorage object for any FAT eMMC BIS partition, mounting it via FatFs and creating a virtual devoptab device that can be used to carry out FS operations. All write operations have been stubbed, disabled or ifdef'd out of the code.
Other changes include:
* cert: update code to use the new BIS storage interface.
* defines: remove BIS_SYSTEM_PARTITION_MOUNT_NAME macro.
* devoptab: slightly improve macros.
* devoptab: add operation table for FatFs devices.
* devoptab: add rodev_fstat().
* devoptab: add devoptabMountFatFsDevice().
* fatfs: update diskio code to use the new BIS storage interface.
* fatfs: update configuration.
* save: update code to use regular C I/O calls instead of FatFs calls.
* tik: update code to use the new BIS storage interface.
* utils: remove eMMC BIS System partition (un)mount code.
