ide: Include hw/ide/internal a bit less outside hw/ide/

According to hw/ide/internal's file comment, only files in hw/ide/ are
supposed to include it.  Drag reality slightly closer to supposition.

Three includes outside hw/ide remain: hw/arm/sbsa-ref.c,
include/hw/ide/pci.h, and include/hw/misc/macio/macio.h.  Turns out
board code needs ide-internal.h to wire up IDE stuff.  More cleanup is
needed.  Left for another day.

Cc: John Snow <jsnow@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20190812052359.30071-11-armbru@redhat.com>