arm: Remove unused references to CONFIG_SOC_DM*

There are no references to CONFIG_SOC_DM355 / CONFIG_SOC_DM365 /
CONFIG_SOC_DM644X / CONFIG_SOC_DM646X and the files these Makefile lines
reference have already been dropped.

Signed-off-by: Tom Rini <trini@konsulko.com>
1 file changed