arm64: configs: Update configs for Khadas VIM3

arm64: configs: Update configs for Khadas VIM3

This patch updates the kernel configurations for Khadas VIM3
to provide full support in the tizen_kvims_defconfig

1. CONFIG_AUTOFS_FS: Reflects changed automounter configuration.
As of Linux Kernel version 4.18, the configuration option for
automounter support has changed from AUTOFS4_FS to AUTOFS_FS.
This patch updates the kernel configuration to reflect this change.

2. CONFIG_DEBUG_KERNEL: Activates debugging and identifying kernel
problems. If this config is enabled, CONFIG_FTRACE will be enabled
by default.

3. CONFIG_DEBUG_FS: Enables Debug Filesystem.

Change-Id: Id849bee90ff6999c3968fea530f83e0b3befd492
Signed-off-by: Yongtaek Jeon <ytjeon@samsung.com>