ShellPkg/dblk: Honor the BlockIo alignment requirement.
ShellPkg/dblk: Honor the BlockIo alignment requirement.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Huajing Li <7004e90c53fa0b23eb581d35709cc85a753a7f43@intel.com>
Reviewed-by: Ruiyu Ni <9fa3a6894a36bca79e6a72ad65af5a5702efecd1@intel.com>

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