boards: nsim: disable CONFIG_SMP by default for nsim_hs_smp

* CONFIG_SMP can be enabled by smp application, e.g. tests/kernel/smp
* if application is not designed for smp, CONFIG_SMP can be disabled,
and the target works as a single processor.

Signed-off-by: Wayne Ren <[email protected]>

Author: Wayne Ren

boards/arc/nsim/nsim_hs_smp_defconfig

@@ -15,4 +15,3 @@ CONFIG_CONSOLE=y
 CONFIG_UART_CONSOLE=y
 CONFIG_SERIAL=y
 CONFIG_ARC_EXCEPTION_DEBUG=y
-CONFIG_SMP=y