1. add oases souce code to drivers/char/oases

2. add oases in file drivers/char/Kconfig

	source "drivers/char/oases/Kconfig"

3. add oases in file drivers/char/Makefile

	obj-$(CONFIG_OASES) += oases/

4. kernel config dependence:

	CONFIG_MODULE_FORCE_UNLOAD should not be set

	on arm64, for Linux version before 3.18:

	CONFIG_STRICT_MEMORY_RWX is not set