Fix trim-related issues

Fixes:
* Use uint64 instead of off_t when handling offset and size
of the trimmed range in the fs_trim_data structure
* BlockAllocator::Trim: Correct the size of a buffer
* ram_disk, mmc: Do not trim past device capacity

Improvements:
* BlockAllocator::Trim: Because the received offset and size
are ignored by BFS (the functionality is not implemented yet),
return B_UNSUPPORTED if the range does not cover the whole
partition
* ram_disk, mmc: More accurate calculation of the number
of trimmed bytes
* devfs: Add a uint64 version of translate_partition_access()

Change-Id: I24f4c08674f123ad33a5fef6e28996a4ada6ff0d
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4155
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>

mmc_disk: implement B_TRIM_DEVICE

Change-Id: Ib08a1e196441f35550fe221b912332b4803a04b4
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3641
Reviewed-by: Jérôme Duval <jerome.duval@gmail.com>

trim support code: The passed in MemoryDeleter was never used.

When a buffer has to be allocated, I guess the intention was to
assign the MemoryDeleter to it, so that it would later be freed.
CID 1130505

trim: Added is_called_via_syscall() function.

* And use it in get_trim_data_from_user(), formerly known as copy_*().
* This fixes differentiating between user and kernel buffers.

trim: Target SCSI UNMAP command instead of WRITE SAME.

* The UNMAP command is theoretically much faster, as it can get many block
ranges instead of just a single range.
* Furthermore, the ATA TRIM command resembles it much better.
* Therefore, fs_trim_data now gets an array of ranges, and we use SCSI UNMAP
to trim.
* Updated BFS code to collect array ranges to fully support the new
fs_trim_data possibilities.

trim support code: The passed in MemoryDeleter was never used.

When a buffer has to be allocated, I guess the intention was to
assign the MemoryDeleter to it, so that it would later be freed.
CID 1130505

trim: Added is_called_via_syscall() function.

* And use it in get_trim_data_from_user(), formerly known as copy_*().
* This fixes differentiating between user and kernel buffers.

trim: Target SCSI UNMAP command instead of WRITE SAME.

* The UNMAP command is theoretically much faster, as it can get many block
ranges instead of just a single range.
* Furthermore, the ATA TRIM command resembles it much better.
* Therefore, fs_trim_data now gets an array of ranges, and we use SCSI UNMAP
to trim.
* Updated BFS code to collect array ranges to fully support the new
fs_trim_data possibilities.