Ensure that AUX mixer is loaded when 2nd bank is present

ROMFS/px4fmu_common/init.d-posix/rcS

@@ -21,6 +21,7 @@ fi
 
 # initialize script variables
 set AUX_MODE                    none
+set AUX_BANK2			none
 set IO_PRESENT                  no
 set MAV_TYPE                    none
 set MIXER                       none

ROMFS/px4fmu_common/init.d/rc.interface

@@ -30,7 +30,7 @@ then
 fi
 
 # USE_IO is set to 'no' for all boards w/o px4io driver or SYS_USE_IO disabled
-if [ $USE_IO = no ]
+if [ $USE_IO = no -a $AUX_BANK2 = none ]
 then
 	set AUX_MODE none
 fi

boards/cuav/x7pro/init/rc.board_defaults

@@ -3,6 +3,9 @@
 # board specific defaults
 #------------------------------------------------------------------------------
 
+# Enables the 2nd bank of mixers
+set AUX_BANK2 yes
+
 param set-default BAT_V_DIV 18
 param set-default BAT1_V_DIV 18
 param set-default BAT2_V_DIV 18