[U-Boot] [U-Boot, v2, 15/42] Kconfig: Convert CMD_READ to Kconfig

[Philipp Tomsich]

> Convert this option and enable it in sandbox. Also correct a bug which
> was introduced with the block-device driver model conversion.
> 
> Signed-off-by: Simon Glass <sjg at chromium.org>
> Reviewed-by: Bin Meng <bmeng.cn at gmail.com>
> ---
> 
> Changes in v2:
> - Move CMD_PORTIO changes to previous patch
> - Sort Kconfig options in alphabetical order
> 
>  README                       | 1 -
>  cmd/Kconfig                  | 5 +++++
>  cmd/read.c                   | 2 +-
>  configs/sandbox_defconfig    | 3 +++
>  include/config_cmd_all.h     | 1 -
>  scripts/config_whitelist.txt | 1 -
>  6 files changed, 9 insertions(+), 4 deletions(-)
> 

Reviewed-by: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>