OvmfPkg/VirtNorFlashDxe: clone ArmPlatformPkg's NOR flash driver

OvmfPkg/VirtNorFlashDxe: clone ArmPlatformPkg's NOR flash driver

QEMU's mach-virt is loosely based on ARM Versatile Express, and inherits
its NOR flash driver, which is now being used on other QEMU emulated
architectures as well.

In order to permit ourselves the freedom to optimize this driver for
use under KVM emulation, let's clone it into OvmfPkg, so we have a
version we can hack without the risk of regressing bare metal platforms.

The cloned version is mostly identical to the original, but it depends
on the newly added VirtNorFlashPlatformLib library class instead of the
original one from ArmPlatformPkg. Beyond that, only cosmetic changes
related to #include order etc were made.

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