arm: socfpga: Move cache_enable to CPU code

arm: socfpga: Move cache_enable to CPU code

Move icache_enable() and dcache_enable() function calls from
board code into the CPU code and into the enable_caches()
function. This is how the cache enabling code was designed
to work.

Signed-off-by: Marek Vasut <[email protected]>
Cc: Dinh Nguyen <[email protected]>
Cc: Pavel Machek <[email protected]>
Cc: Marek Vasut <[email protected]>
Cc: Tom Rini <[email protected]>
Cc: Albert Aribaud <[email protected]>
Cc: Wolfgang Denk <[email protected]>
Acked-by: Pavel Machek <[email protected]>