libutee: add unwind pseudo-ops to syscall wrappers

It is currently not possible to unwind a call stack from within a
syscall wrapper, that is the utee_xxx() functions such as utee_panic()
for instance. That is because the assembler macro that defines the
utee_ functions lacks the proper .fnstart/.save/.fnend pseudo-ops.
Add them.

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

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