small modules fixes

conf/modules/alt_srf08.xml

@@ -9,7 +9,7 @@
   <!-- 65ms since initiate_ranging() (the spec ask for 65ms), 
        delay="4", 60Hz, 4x 16.7ms = 66.7ms -->
   <periodic fun="srf08_receive()" freq="1" delay="4"/>
-  <event fun="srf08_event"/>
+  <event fun="srf08_event()"/>
   <makefile>
     <file name="alt_srf08.c"/>
     <flag name="TELEMETER"/>

conf/modules/baro_MS5534A.xml

@@ -7,7 +7,7 @@
   <init fun="baro_MS5534A_init()"/>
   <periodic fun="baro_MS5534A_send()" freq="20"/>
   <event fun="baro_MS5534A_event()"/>
-  <makefile>
+  <makefile target="ap">
     <file name="baro_MS5534A.c"/>
     <flag name="USE_BARO_MS5534A"/>
     <flag name="USE_SPI_SLAVE0"/>

conf/modules/mag_micromag_fw.xml

@@ -8,7 +8,7 @@
   <init fun="micromag_init()"/>
   <periodic fun="micromag_periodic()" freq="60"/>
   <event fun="micromag_event()"/>
-  <makefile>
+  <makefile target="ap">
     <file_hw name="micromag_fw_hw.c"/>
     <file name="micromag_fw.c"/>
   </makefile>