configs: reorganize linaro-base*.conf config fragments

Currently we have linaro-base.conf (all basic config options, arch/arm
specific included), and linaro-base64.conf (config options we use for
arm64 builds). So for arm 32-bit builds one should use linaro-base.conf,
while for arm 64-bit ones - linaro-base.conf *plus* linaro-base64.conf.
This is 1) confusing (some patches I receive treat linaro-base64.conf
as the only linaro-base* fragment to be used for 64-bit builds, and do
the same changes to both linaro-base.conf and linaro-base64.conf), and
2) not quite right to have arch/arm specific options in the config fragment
used for arch/arm64 builds.

Let's leave all the generic options in linaro-base.conf, and put the arch
specific ones into separate config fragments. So that the use pattern would
become the same for arm 32-bit and 64-bit builds:
* 32-bit case: use linaro-base.conf plus linaro-base-arm.conf
* 64-bit case: use linaro-base.conf plus linaro-base-arm64.conf

Not to break the current builds, the options moved to linaro-base-arm.conf
are not removed from linaro-base.conf by this commit. This will be done
later, when all the builds are updated to use linaro-base.conf plus
linaro-base-arm.conf.

Signed-off-by: Andrey Konovalov <andrey.konovalov@linaro.org>

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