powerpc sstep: Add support for prefixed load/stores

This adds emulation support for the following prefixed integer
load/stores:
  * Prefixed Load Byte and Zero (plbz)
  * Prefixed Load Halfword and Zero (plhz)
  * Prefixed Load Halfword Algebraic (plha)
  * Prefixed Load Word and Zero (plwz)
  * Prefixed Load Word Algebraic (plwa)
  * Prefixed Load Doubleword (pld)
  * Prefixed Store Byte (pstb)
  * Prefixed Store Halfword (psth)
  * Prefixed Store Word (pstw)
  * Prefixed Store Doubleword (pstd)
  * Prefixed Load Quadword (plq)
  * Prefixed Store Quadword (pstq)

the follow prefixed floating-point load/stores:
  * Prefixed Load Floating-Point Single (plfs)
  * Prefixed Load Floating-Point Double (plfd)
  * Prefixed Store Floating-Point Single (pstfs)
  * Prefixed Store Floating-Point Double (pstfd)

and for the following prefixed VSX load/stores:
  * Prefixed Load VSX Scalar Doubleword (plxsd)
  * Prefixed Load VSX Scalar Single-Precision (plxssp)
  * Prefixed Load VSX Vector [0|1]  (plxv, plxv0, plxv1)
  * Prefixed Store VSX Scalar Doubleword (pstxsd)
  * Prefixed Store VSX Scalar Single-Precision (pstxssp)
  * Prefixed Store VSX Vector [0|1] (pstxv, pstxv0, pstxv1)

Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
Reviewed-by: Balamuruhan S <bala24@linux.ibm.com>
[mpe: Use CONFIG_PPC64 not __powerpc64__, use get_op()]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200506034050.24806-30-jniethe5@gmail.com

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