trap: don't mislead about SCTLR.V being not set
It's been quite a while since the exception table got moved via the high
vector bit (SCTLR.V).

*** 14,25 ****
  #include <sys/asm_linkage.h>
  #include <sys/cpu_asm.h>
  
  /*
   * Create a section into which to place the exception vector, such that we can
!  * force it to be mapped where it needs to be.  Currently at 0x0, since
!  * we don't set the high vector bit (SCTLR.V)
   *
   * Each instruction in the vector jumps to its own address + 24, which is the
   * matching entry in exception_table.  We do this to insure that we get
   * effectively infinite displacement, which we can't achieve in one
   * instruction otherwise (and gas complains).
--- 14,24 ----
  #include <sys/asm_linkage.h>
  #include <sys/cpu_asm.h>
  
  /*
   * Create a section into which to place the exception vector, such that we can
!  * force it to be mapped where it needs to be.
   *
   * Each instruction in the vector jumps to its own address + 24, which is the
   * matching entry in exception_table.  We do this to insure that we get
   * effectively infinite displacement, which we can't achieve in one
   * instruction otherwise (and gas complains).