OvmfPkg: clone NorFlashPlatformLib into VirtNorFlashPlatformLib

Create a new library class in Ovmf that duplicates the existing
NorFlashPlatformLib, but which will be tied to the VirtNorFlashDxe
driver that will be introduced in a subsequent patch. This allows us to
retire the original from ArmPlatformPkg.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Sunil V L <sunilvl@ventanamicro.com>

OvmfPkg/OvmfPkg.dec

@@ -101,6 +101,10 @@
   #                  transports.
   VirtioMmioDeviceLib|Include/Library/VirtioMmioDeviceLib.h
 
+  ##  @libraryclass  Provides a Nor flash interface.
+  #
+  VirtNorFlashPlatformLib|Include/Library/VirtNorFlashPlatformLib.h
+
   ##  @libraryclass  Invoke Xen hypercalls
   #
   XenHypercallLib|Include/Library/XenHypercallLib.h