raspberrypi3.conf: Clarify machine mode
#@TYPE: Machine
-#@NAME: RaspberryPi 3 Development Board
-#@DESCRIPTION: Machine configuration for the RaspberryPi 3
+#@NAME: RaspberryPi 3 Development Board (32bit)
+#@DESCRIPTION: Machine configuration for the RaspberryPi 3 in 32 bits mode
DEFAULTTUNE ?= "cortexa7thf-neon-vfpv4"
require conf/machine/include/tune-cortexa7.inc
