rockchip: lion-rk3368: Migrate to use common FIT generator

The RK3368 lion board ATF can use bl31.elf like RK3399 and get the FIT
source with generic FIT generator script at:
arch/arm/mach-rockchip/make_fit_atf.py

And then we can use 'BL31' environment to get the path of bl31.elf
instead of copy it into U-Boot folder.

CC: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
2 files changed