libutee: add tee_uuid_from_str()

Moves internal function parse_uuid() from ldelf/ta_elf.c to libutee so
that it may be used by TAs or other user-space libraries such as the
upcoming libdl. The funct

libutee: add tee_uuid_from_str()

Moves internal function parse_uuid() from ldelf/ta_elf.c to libutee so
that it may be used by TAs or other user-space libraries such as the
upcoming libdl. The function is renamed to tee_uuid_from_str() and
declared in tee_internal_api_extensions.h.

Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>

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