ARM: shmobile: Disconnect EMEV2 SMP code from clocks

Update the EMEV2 SMP code to access the SMU directly
instead of relying on help from the legacy clock code.

This change moves us one step closer to common clocks.

Signed-off-by: Magnus Damm <damm@opensource.se>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>