[U-Boot] rockchip: move CONFIG_ENV_SIZE and CONFIG_ENV_OFFSET to Kconfig

[Philipp Tomsich]

> These settings are not not user visible via a menuconfig prompt. This is
> necessary to have the possibility to select new default values if
> CONFIG_IS_IN_* is changed (interactively or with oldconfig). Otherwise it
> will always be set to a previous value if used with a prompt.
> As an example if we do a defconfig with CONFIG_IS_IN_MMC and change it to
> CONFIG_IS_IN_SPI_FLASH via menuconfig, ENV_SIZE and ENV_OFFSET will not
> be changed to the correct values as defconfig will already have set them
> to the default values of CONFIG_IS_IN_MMC in .config.
> 
> Signed-off-by: Klaus Goger <klaus.goger at theobroma-systems.com>
> ---
> 
>  board/theobroma-systems/puma_rk3399/Kconfig |  6 ++++++
>  env/Kconfig                                 | 19 +++++++++++++++++++
>  include/configs/puma_rk3399.h               |  8 --------
>  include/configs/rockchip-common.h           |  6 ------
>  4 files changed, 25 insertions(+), 14 deletions(-)
> 

Applied to u-boot-rockchip, thanks!