Support for building more modules with Linux

Added more queue support to linux/px4_layer.

Use virt char devices for ms5611, and mavlink.

Added more HRT functionality. uORB latency test
now fails. Likely due to bad HRT impl for Linux.

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

makefiles/linux/config_linux_default.mk

@@ -11,7 +11,8 @@
 # Board support modules
 #
 MODULES		+= drivers/device
-#MODULES		+= modules/sensors
+MODULES		+= modules/sensors
+MODULES		+= drivers/ms5611
 
 #
 # System commands
@@ -21,8 +22,7 @@ MODULES		+= drivers/device
 #
 # General system control
 #
-#MODULES	+= modules/mavlink
-#MODULES		+= modules/mavlink
+MODULES		+= modules/mavlink
 
 #
 # Estimation modules (EKF/ SO3 / other filters)
@@ -48,7 +48,7 @@ MODULES		+= modules/dataman
 MODULES		+= lib/mathlib
 MODULES		+= lib/geo
 MODULES		+= lib/geo_lookup
-#MODULES		+= lib/conversion
+MODULES		+= lib/conversion
 
 #
 # Linux port

makefiles/toolchain_native.mk

@@ -81,7 +81,8 @@ CPP			 = clang$(CLANGVER) -E
 DEV_VER_SUPPORTED	 = 4.2.1
 endif
 
-LD			 = ld.gold
+#LD			 = ld.gold
+LD			 = ld
 AR			 = ar rcs
 NM			 = nm
 OBJCOPY			 = objcopy
@@ -286,7 +287,7 @@ endef
 define PRELINK
 	@$(ECHO) "PRELINK: $1"
 	@$(MKDIR) -p $(dir $1)
-	$(Q) $(LD) -r -o $1 $2
+	$(Q) $(LD) -Ur -o $1 $2
 
 endef
 #	$(Q) $(LD) -Ur -o $1 $2 && $(OBJCOPY) --localize-hidden $1