Add a way to update the boot-mode via machine properties.

Changes for V2:
    Make boot-mode property work with string
    Fixed few code style issues
    Added zynq board doc.
Changes for V3:
    Mentioned about zynq doc in MAINTAINERS file
    Stick to small case for mentioning boot modes in doc
    fixed commit message to mention right property name.


Sai Pavan Boddu (3):
  hw/misc/zynq_slcr: Add boot-mode property
  hw/arm/xilinx_zynq: Add boot-mode property
  docs/system/arm: Add a doc for zynq board

 MAINTAINERS                   |  1 +
 docs/system/arm/xlnx-zynq.rst | 47 +++++++++++++++++++++++++++++++++++
 docs/system/target-arm.rst    |  1 +
 hw/arm/xilinx_zynq.c          | 31 +++++++++++++++++++++++
 hw/misc/zynq_slcr.c           | 22 +++++++++++++++-
 5 files changed, 101 insertions(+), 1 deletion(-)
 create mode 100644 docs/system/arm/xlnx-zynq.rst

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2.34.1