[U-Boot] [PATCH 04/12] x86: doc: Remove stale sections of 64-bit support

[Heinrich Schuchardt]

On 10/13/2018 05:06 PM, Bin Meng wrote:
> There are some sections in current doc saying 64-bit is unsupported.
> This apparently is out of date. Remove it.
> 
> Signed-off-by: Bin Meng <bmeng.cn at gmail.com>
Reviewed-by: Heinrich Schuchardt <xypron.glpk at gmx.de>