ARC: Add omitted defconfig file

After moving to HWMv2 em_starterkit_emsk_em11d_defconfig file was omitted.
Some of tests for the emks_em11d platform became broken.
This PR fixes https://github.com/zephyrproject-rtos/zephyr/issues/71753



Signed-off-by: Nikolay Agishev <agishev@synopsys.com>