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Created by Evan Lojewski@meklortMaintainer

crt: Rework the crt code to support relocatable IVTs

This has a number of changes to cleanup the startup code slightly and to use the new SPR_KAISB feature.

  • Split crt0.s into crt0.s and crt1.s with crt0.s only initializing the .TOC. pointer (%r2) and the stack pointer (%r1).
  • Split crt0.s into crt0.s and ivt.s with ivt.s containing all interrupt related code.
  • Move exceptions to SRAM
  • Remove __isr_address as this can now be handled by SPR_KAISB
  • Replace LOAD_IMM64 with LOAD_IMM32 as the microwatt only has <4G of physical address space.
  • Enable linting with FlexeLint on crt1.s

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