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>
diff --git a/configs/k2l_evm_defconfig b/configs/k2l_evm_defconfig
index 4a70e1a..c817585 100644
--- a/configs/k2l_evm_defconfig
+++ b/configs/k2l_evm_defconfig
@@ -8,7 +8,7 @@
 CONFIG_SPL_SERIAL_SUPPORT=y
 CONFIG_SPL_SPI_FLASH_SUPPORT=y
 CONFIG_SPL_SPI_SUPPORT=y
-CONFIG_DEFAULT_DEVICE_TREE="k2l-evm"
+CONFIG_DEFAULT_DEVICE_TREE="keystone-k2l-evm"
 CONFIG_OF_BOARD_SETUP=y
 CONFIG_SYS_CONSOLE_INFO_QUIET=y
 CONFIG_VERSION_VARIABLE=y