[RTEMS Project] #4684: Support Versal DDRMC0 regions 0 and 1

[RTEMS trac]

#4684: Support Versal DDRMC0 regions 0 and 1
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  Reporter:  Chris Johns  |      Owner:  Chris Johns
      Type:  defect       |     Status:  assigned
  Priority:  normal       |  Milestone:  6.1
 Component:  bsps         |    Version:  6
  Severity:  normal       |   Keywords:
Blocked By:               |   Blocking:
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 The Versal's DDRMC0 supports region 0 and 1. Region 0's base address
 defaults to `0x00000000000` and can be up to 2G in length. If the hardware
 has more than 2G of DDR memory it is placed in region 1 and it's default
 base address is `0x00800000000` placing it in the A64 address space.

 Add support so the user defined memory length
 `BSP_XILINX_VERSAL_RAM_LENGTH` spans region 0 and 1.

 Extend the heap with the region 1 memory.

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Ticket URL: <http://devel.rtems.org/ticket/4684>
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