OvmfPkg/XenIoMmioLib: add missing MemoryAllocationLib dependency to INF
OvmfPkg/XenIoMmioLib: add missing MemoryAllocationLib dependency to INF

XenIoMmioLib depends on MemoryAllocationLib, and uses its header, but
failed to declare the dependency in its INF.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <66d3c5fdaeea7ff1f996ad04f2c45e08ab38e2f5@linaro.org>
Reviewed-by: Laszlo Ersek <7437296077edea1cb64451c122c4dac071f0cfbc@redhat.com>

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