[RTEMS Project] #4779: RISC-V: Remove RISCV_ENABLE_HTIF_SUPPORT option

[RTEMS trac]

#4779: RISC-V: Remove RISCV_ENABLE_HTIF_SUPPORT option
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  Reporter:  Hesham Almatary  |      Owner:  (none)
      Type:  enhancement      |     Status:  new
  Priority:  normal           |  Milestone:
 Component:  admin            |    Version:
  Severity:  normal           |   Keywords:
Blocked By:                   |   Blocking:
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 Currently **RISCV_ENABLE_HTIF_SUPPORT** [1] is required to be set to 1 for
 Spike platform. This adds more confusions to users and doubles the number
 of BSPs for testing on both QEMU and Spike.

 I suggest removing the RISCV_ENABLE_HTIF_SUPPORT option and always prob
 for it in the FDT in the C code (only during init and shutdown), it
 shouldn't affect any critical paths.

 This should get us a single BSP that runs on both QEMU and Spike.

 [1] https://docs.rtems.org/branches/master/user/bsps/bsps-riscv.html

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Ticket URL: <http://devel.rtems.org/ticket/4779>
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