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uniphier_scp_is_running() reads the UNIPHIER_STMBE2COM register,
but it does not exist on all SoCs.

Do not call this function if the on-chip SCP is not supported.

Change-Id: I7c71ca0735e3a8e095c3f22ba6165f82a2986362
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>