SUBSYSTEMS.md: add myself to the list

SUBSYSTEMS.md

@@ -18,15 +18,27 @@ affect more than one module.
 
 ## ARM Cortex-M
 
+### Atmel Sam0 line (SAM D1x/D2x, L1x, L2x, D5x)
+
+ - Benjamin Valentin (@benpicco)
+
 ## Atmel AVR (Atmega)
 
 ## Native
 
+### ZEP radio simulation & ZEP dispatcher
+
+ - Benjamin Valentin (@benpicco)
+
 # Hardware modules
 
 ## Network devices
 ### IEEE 802.15.4
 
+#### AT86RF215
+
+ - Benjamin Valentin (@benpicco)
+
 ### BLE
 
 ### LoRa
@@ -47,6 +59,10 @@ affect more than one module.
 
 ## Power Management
 
+## MTD Subsystem
+
+ - Benjamin Valentin (@benpicco)
+
 ## File Systems
 
 ## USB support
@@ -66,6 +82,10 @@ affect more than one module.
 ## Network stacks
 ### GNRC
 
+#### IPv6 Auto-Subnetting
+
+ - Benjamin Valentin (@benpicco)
+
 ### CCN-Lite
 
 ### OpenThread
@@ -93,6 +113,10 @@ affect more than one module.
 ## Application protocols
 ### CoAP
 
+#### nanoCoAP
+
+ - Benjamin Valentin (@benpicco)
+
 ### MQTT
 
 ### LWM2M