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.

Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>

idea is taken here - https://github.com/franciscofranco/manta/commit/f62eb013207cea264e27f36217334ec953d9bf84