hw/arm: xlnx-versal-virt: Add Xilinx eFUSE device

hw/arm: xlnx-versal-virt: Add Xilinx eFUSE device

Connect the support for Versal eFUSE one-time field-programmable
bit array.

The command argument:
  -drive if=pflash,index=1,...
Can be used to optionally connect the bit array to a
backend storage, such that field-programmed values
in one invocation can be made available to next
invocation.

The backend storage must be a seekable binary file, and
its size must be 3072 bytes or larger. A file with all
binary 0's is a 'blank'.

Signed-off-by: Tong Ho <tong.ho@xilinx.com>
Message-id: 20210917052400.1249094-7-tong.ho@xilinx.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>