ARM: prima2: Drop unneeded select of HAVE_SMP

Support for CSR SiRF SoCs depends on ARCH_MULTI_V7.
As the latter selects HAVE_SMP, there is no need for ARCH_ATLAS7 to
select HAVE_SMP.

Link: https://lore.kernel.org/r/20200505150722.1575-14-geert+renesas@glider.be


Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Barry Song <baohua@kernel.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>