Enable nbtty on the serial port

This addresses a possible blocking problem that was seen on the
Raspberry Pi Zero and makes it possible react to terminal window size
changes.

Author: fhunleth

nerves_defconfig

@@ -31,18 +31,15 @@ BR2_LINUX_KERNEL_EXT_KERNEL_WIRELESS_REGDB=y
 BR2_PACKAGE_BUSYBOX_CONFIG="${NERVES_DEFCONFIG_DIR}/bbb-busybox.config"
 BR2_PACKAGE_E2FSPROGS=y
 # BR2_PACKAGE_E2FSPROGS_FSCK is not set
-BR2_PACKAGE_FWUP=y
 BR2_PACKAGE_LINUX_FIRMWARE=y
 BR2_PACKAGE_LINUX_FIRMWARE_RALINK_RT2XX=y
 BR2_PACKAGE_LINUX_FIRMWARE_RTL_87XX=y
 BR2_PACKAGE_LINUX_FIRMWARE_TI_WL18XX=y
 BR2_PACKAGE_RNG_TOOLS=y
 BR2_PACKAGE_UBOOT_TOOLS=y
 BR2_PACKAGE_LIBMNL=y
-BR2_PACKAGE_NCURSES=y
 BR2_PACKAGE_WPA_SUPPLICANT=y
 BR2_PACKAGE_WPA_SUPPLICANT_DEBUG_SYSLOG=y
-BR2_TARGET_ROOTFS_SQUASHFS=y
 # BR2_TARGET_ROOTFS_TAR is not set
 BR2_TARGET_UBOOT=y
 BR2_TARGET_UBOOT_BOARDNAME="am335x_evm"
@@ -55,7 +52,5 @@ BR2_TARGET_UBOOT_SPL_NAME="MLO"
 BR2_PACKAGE_HOST_UBOOT_TOOLS=y
 BR2_NERVES_SYSTEM_NAME="nerves_system_bbb"
 BR2_PACKAGE_BBORG_OVERLAYS=y
-BR2_PACKAGE_BOARDID=y
+BR2_PACKAGE_NBTTY=y
 BR2_PACKAGE_NERVES_CONFIG=y
-BR2_PACKAGE_NERVES_CONFIG_NO_ERLINIT_CONF=y
-BR2_PACKAGE_NERVES_CONFIG_APPS="crypto"

rootfs_overlay/etc/erlinit.config

@@ -16,6 +16,7 @@
 # Use dtach to capture the iex session so that it can be redirected to the
 # app's GUI
 #-s "/usr/bin/dtach -N /tmp/iex_prompt"
+-s "/usr/bin/nbtty"
 
 # Specify the user and group IDs for the Erlang VM
 #--uid 100