libutils: move ASan runtime and tests from core to libutils

This patch relocates the ASan runtime and its self-tests from the core
to libutils/ext. While ASan is still only enabled for the TEE core,

libutils: move ASan runtime and tests from core to libutils

This patch relocates the ASan runtime and its self-tests from the core
to libutils/ext. While ASan is still only enabled for the TEE core, this
refactoring removes core-specific placement and makes the code
available to other components.

The main benefit is that ASan support and the test helpers can now be
potentially reused by ldelf and TAs in the future, instead of being
tied to the core build. The existing ASan core behaviour is unchanged.

Signed-off-by: Aleksandr Iashchenko <aleksandr.iashchenko@linutronix.de>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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