ARM: dts: k2*: Rename the k2* files to keystone-k2* files

ARM: dts: k2*: Rename the k2* files to keystone-k2* files

As reported in [1], rename the k2* dts files to keystone-* files
this will force consistency throughout.

Script for the same (and hand modified for Makefile and config
files):
for i in arch/arm/dts/k2*
do
	b=`basename $i`;
	git mv $i arch/arm/dts/keystone-$b;
	sed -i -e "s/$b/keystone-$b/g" arch/arm/dts/*[si]
done

This is similar to linux kernel commit 5edafc29829bc ("ARM: dts: k2*: Rename
the k2* files to keystone-k2* files")

[1] http://marc.info/?l=linux-arm-kernel&m=145637407804754&w=2

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>