Adding <asm/exception.h> brought in <asm/kprobes.h> which uses
<asm/probes.h>, which uses 'pstate_check_t' so the latter needs to
#include <asm/insn.h> for this typedef.

Fixes this build error:

  In file included from arch/arm64/include/asm/kprobes.h:24,
                    from arch/arm64/include/asm/exception.h:11,
                    from arch/arm64/kernel/fpsimd.c:35:
  arch/arm64/include/asm/probes.h:16:2: error: unknown type name 'pstate_check_t'
      16 |  pstate_check_t *pstate_cc;

Fixes: c6b90d5c ("arm64/fpsimd: Fix missing-prototypes in fpsimd.c")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Will Deacon <will@kernel.org>
Cc: Tian Tao <tiantao6@hisilicon.com>
Link: https://lore.kernel.org/r/20201123044510.9942-1-rdunlap@infradead.orgSigned-off-by: Will Deacon <will@kernel.org>