ARM: mm: rename jump labels in v7_flush_dcache_all function

This patch renames jump labels in v7_flush_dcache_all in order to define
a specific flush cache levels entry point.

TODO: factor out the level flushing loop if considered worthwhile and
      define the input registers requirements.

Change-Id: I4513469f9618bb1cb66c71cc53501bcbd60b8c4b
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
Signed-off-by: Paul Reioux <reioux@gmail.com>