beaglebone: add am33x-cm3 to the build

Add the FW needed for the Cortex M3 on the beaglebone. This is required
for working power management.

Signed-off-by: Anders Darander <anders@chargestorm.se>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

configs/beaglebone_defconfig

@@ -11,6 +11,7 @@ BR2_TARGET_GENERIC_GETTY_PORT="ttyO0"
 # BR2_TARGET_GENERIC_REMOUNT_ROOTFS_RW is not set
 
 # filesystem
+BR2_PACKAGE_AM33X_CM3=y
 BR2_TARGET_ROOTFS_EXT2=y
 # BR2_TARGET_ROOTFS_TAR is not set