ARC: nsim_hs38: Add support of Virtio NET & BLK

Given now nsim_hs38 configuration is usable on QEMU and in QEMU
we have Virtio working perfectly fine the next logical step
is to add support of supported & known to work net & bkl to this
config.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index 0cb9720..545fc3e 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -160,7 +160,7 @@
 	bool "Support tb100"
 
 config TARGET_NSIM
-	bool "Support standalone nSIM & Free nSIM"
+	bool "Support ARC simulation & prototyping platforms"
 
 config TARGET_AXS101
 	bool "Support Synopsys Designware SDP board AXS101"
@@ -184,10 +184,10 @@
 endchoice
 
 source "board/abilis/tb100/Kconfig"
-source "board/synopsys/Kconfig"
 source "board/synopsys/axs10x/Kconfig"
 source "board/synopsys/emsdp/Kconfig"
 source "board/synopsys/hsdk/Kconfig"
 source "board/synopsys/iot_devkit/Kconfig"
+source "board/synopsys/nsim/Kconfig"
 
 endmenu