Linker script rework

`memory.ld` is a architecture-dependent ld config provides some general
    symbols which every `memory.ld` config must assign
    and memory regions associated with each output section.

'linker.ld' config file presents segments configuration.

Multiboot section filling move in the 'linker.ld' file.

Recommendation for further patches: controlled logic implementation for multiboot
    version and header/entries in build configuration tool (CMake or
    make). For instance, multiboot version and video mode selection
    through variable passing in build system:
    `cmake ... -DMULTIBOOT_VERSION=2 -DMULTIBOOT_VIDEO_MODE=TEXT_VIDEO_MODE`
    or
    'export MULTIBOOT_VERSION=2; export MULTIBOOT_VIDEO_MODE=TEXT_VIDEO_MODE'.
    Then build system do proper filling of `.multiboot` section depends
    on passing variables.

Signed-off-by: Alexey Gavrilov <alexey.gavrilov@mail.com>

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