core: riscv: add stmm and sp prototypes

Provide a declaration of functions is_sp_ctx(), is_stmm_ctx(), to_sp_ctx()
and to_stmm_ctx() to avoid build errors.

Signed-off-by: Marouene Boubakri <marouen

core: riscv: add stmm and sp prototypes

Provide a declaration of functions is_sp_ctx(), is_stmm_ctx(), to_sp_ctx()
and to_stmm_ctx() to avoid build errors.

Signed-off-by: Marouene Boubakri <marouene.boubakri@nxp.com>
Acked-by: Etienne Carriere <etienne.carriere@linaro.org>

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