sim:thermal: move etc romfs mount from nsh to sched/init

Ref: I7afe1047369e91662583c8ef9c98fffcf567fbb7
```
sched: move etc romfs mount from nsh to sched/init
```
Signed-off-by: wangjianyu3 <wangjianyu3@xiaomi.com>

Author: JianyuWang0623

boards/sim/sim/sim/configs/thermal/defconfig

@@ -26,10 +26,15 @@ CONFIG_DEBUG_THERMAL_WARN=y
 CONFIG_DEV_GPIO=y
 CONFIG_DEV_LOOP=y
 CONFIG_DEV_ZERO=y
+CONFIG_ETC_FATDEVNO=2
+CONFIG_ETC_ROMFS=y
+CONFIG_ETC_ROMFSDEVNO=1
 CONFIG_EXAMPLES_GPIO=y
 CONFIG_EXAMPLES_HELLO=y
 CONFIG_FAT_LCNAMES=y
 CONFIG_FAT_LFN=y
+CONFIG_FSUTILS_PASSWD=y
+CONFIG_FSUTILS_PASSWD_READONLY=y
 CONFIG_FS_BINFS=y
 CONFIG_FS_FAT=y
 CONFIG_FS_PROCFS=y
@@ -48,13 +53,11 @@ CONFIG_LIBC_LOCALE_GETTEXT=y
 CONFIG_LIBC_MAX_EXITFUNS=1
 CONFIG_LIBC_NUMBERED_ARGS=y
 CONFIG_NSH_ARCHINIT=y
-CONFIG_NSH_ARCHROMFS=y
 CONFIG_NSH_BUILTIN_APPS=y
-CONFIG_NSH_FATDEVNO=2
 CONFIG_NSH_FILE_APPS=y
+CONFIG_NSH_MOTD=y
+CONFIG_NSH_MOTD_STRING="MOTD: username=admin password=Administrator"
 CONFIG_NSH_READLINE=y
-CONFIG_NSH_ROMFSDEVNO=1
-CONFIG_NSH_ROMFSETC=y
 CONFIG_PATH_INITIAL="/bin"
 CONFIG_PM=y
 CONFIG_PSEUDOFS_ATTRIBUTES=y