soc: arc: snps_nsim: delete C file with no code

soc_config.c for snps_nsim had no actual code, just a bunch of includes.
Deleting as it has no value (and triggered a compliance warning because
file had no newline at EOF).

Signed-off-by: Gerard Marull-Paretas <[email protected]>

Author: gmarull

soc/arc/snps_nsim/CMakeLists.txt

@@ -53,7 +53,4 @@ else()
   zephyr_ld_option_ifdef(CONFIG_SOC_NSIM_HS_MPUV6 -Hlib=hs38_full)
 endif()
 
-zephyr_sources(
-  soc.c
-  soc_config.c
-  )
+zephyr_sources(soc.c)