[U-Boot] [U-Boot, v2, 1/8] rockchip: add sdram_common for common functions

[Philipp Tomsich]

> There are some functions like sdram_size_mb can be re-used for
> different rockchip SoCs, just put them into common file.
> Add board_get_usable_ram_top() for ram_top init base on
> SDRAM_MAX_SIZE.
> 
> Signed-off-by: Kever Yang <kever.yang at rock-chips.com>
> ---
> 
> Changes in v2:
> - add board_get_usable_ram_top()
> 
>  arch/arm/include/asm/arch-rockchip/sdram_common.h | 58 ++++++++++++++++
>  arch/arm/mach-rockchip/Makefile                   |  3 +
>  arch/arm/mach-rockchip/sdram_common.c             | 83 +++++++++++++++++++++++
>  include/configs/rk3188_common.h                   |  1 +
>  include/configs/rk3288_common.h                   |  1 +
>  include/configs/rk3328_common.h                   |  2 +-
>  include/configs/rk3368_common.h                   |  2 +
>  include/configs/rk3399_common.h                   |  1 +
>  8 files changed, 150 insertions(+), 1 deletion(-)
>  create mode 100644 arch/arm/include/asm/arch-rockchip/sdram_common.h
>  create mode 100644 arch/arm/mach-rockchip/sdram_common.c
> 

Applied to u-boot-rockchip/next, thanks!