pta: rng: rename rng_pta_client.h to pta_rng.h

Renames RNG PTA exported header file from rng_pta_client.h to pta_rng.h
as the later follows PTAs header file name convention in optee_os
that is pta_x

pta: rng: rename rng_pta_client.h to pta_rng.h

Renames RNG PTA exported header file from rng_pta_client.h to pta_rng.h
as the later follows PTAs header file name convention in optee_os
that is pta_xxx.h.

Preserve rng_pta_client.h for backward compatibility. That header file
only includes pta_rng.h.

Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>

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