at91: disable legacy PTYs and virtual terminals

Enabling legacy PTYs causes problems with procd-hotplug.
And as this is a headless target, no need to have virtual terminals.
Remove corresponding kernel config options, they are disabled in
generic kernel config.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
(cherry picked from commit c1db4d9c56)

target/linux/at91/config-4.14

@@ -315,8 +315,6 @@ CONFIG_LEDS_TRIGGER_CPU=y
 # CONFIG_LEDS_TRIGGER_DEFAULT_ON is not set
 CONFIG_LEDS_TRIGGER_GPIO=y
 CONFIG_LEDS_TRIGGER_HEARTBEAT=y
-CONFIG_LEGACY_PTYS=y
-CONFIG_LEGACY_PTY_COUNT=4
 CONFIG_LIBFDT=y
 CONFIG_LOCALVERSION_AUTO=y
 CONFIG_LOG_BUF_SHIFT=16
@@ -556,10 +554,6 @@ CONFIG_VIDEOMODE_HELPERS=y
 CONFIG_VIDEO_DEV=y
 CONFIG_VIDEO_V4L2=y
 CONFIG_VM_EVENT_COUNTERS=y
-CONFIG_VT=y
-CONFIG_VT_CONSOLE=y
-CONFIG_VT_CONSOLE_SLEEP=y
-# CONFIG_VT_HW_CONSOLE_BINDING is not set
 CONFIG_WATCHDOG_CORE=y
 # CONFIG_WQ_POWER_EFFICIENT_DEFAULT is not set
 CONFIG_ZBOOT_ROM_BSS=0x0