ARM: 5888/1: arm: Update comments in cacheflush.h and remove unnecessary V6 and V7 comments

BugLink: http://bugs.launchpad.net/bugs/319240
commit 2045124f

 upstream

The comments in cacheflush.h should follow what's in
struct cpu_cache_fns. The comments for V6 and V7 are
unnecessary.

(bryan.wu@canonical.com: back ported it to 2.6.31 for fsl-imx51)

Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>