malta: add config file for kernel 3.19.

This is based on config-3.18 with the following changes.

 - CONFIG_GENERIC_NET_UTILS is removed as it is already set in generic
   kernel config.
 - CONFIG_CPU_MICROMIPS is explicitly unset as required in kernel 3.19.

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

SVN-Revision: 44388