libutils: add nex_strdup() function

This is the same as strdup() but it uses nex_malloc(), so
it can be used in nexus part of OP-TEE.

Signed-off-by: Volodymyr Babchuk <vlad.babchuk@gmail.com>
Revie

libutils: add nex_strdup() function

This is the same as strdup() but it uses nex_malloc(), so
it can be used in nexus part of OP-TEE.

Signed-off-by: Volodymyr Babchuk <vlad.babchuk@gmail.com>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>

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