MFC r257170, r257171, r257172, r257240, r257278, r257279, r257280, r257281,

MFC r257170, r257171, r257172, r257240, r257278, r257279, r257280, r257281,
    r257282, r257332

  Wait for DesignWare UART transfers completion before accessing line control

  Enable UART busy detection handling for Armada XP - based board

  Enable SATA interface on Armada XP
  Run mvs SATA driver on Armada XP instead of old mv_sata

  Retire arm_remap_nocache() and the data and constants associated with it.

  Remove hard-coded mappings related to Armada XP support

  Fix-up DTB for Armada XP registers' base according to the actual settings

  Change Armada XP kernel load address to the u-boot's end address

  Remove not working and deprecated PJ4Bv6 support

  Switch off explicit broadcasting of the TLB flush operations for PJ4B CPU

  Add missing ARMv6 CPU functions to ARM Makefile

git-svn-id: svn://svn.freebsd.org/base/stable/10@266046 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f