[PATCH v4 2/5] ntdll: Allow NtQueryVolumeInformationFile to make async volume information queries.

[Erich E. Hoover]

This patch allows NtQueryVolumeInformationFile to pass
FileFsVolumeInformation and FileFsAttributeInformation requests to the
mountmgr (as well as other device drivers).  These requests currently
do not work for NT device paths, which results in a bunch of
duplication in kernelbase.

v4: Reordered (no content change)
v3: No change
v2: Split

Best,
Erich