Create system_utils component

Somewhat of a 'misc' component; handles early initialization, checking
for first boot and rebooting.

components/system_utils/CMakeLists.txt

@@ -0,0 +1,5 @@
+idf_component_register(
+  SRCS "system_utils.c"
+  INCLUDE_DIRS "."
+  REQUIRES esp_system fatal nvs_flash time
+)