ARM: 6278/2: fix regression in RealView after the introduction of pclk

The patch to add the apb_pclk to the AMBA/PrimeCell bus broke
RealView, since the clockdevice is not registered at probe() time.
This moves clock initialization to a core_initcall()

[rmk:moved before the problematical commit to avoid bisect problems]
Signed-off-by: NLinus Walleij <linus.walleij@stericsson.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-realview/core.c

@@ -347,7 +347,7 @@ static int __init clk_init(void)
 
 	return 0;
 }
-arch_initcall(clk_init);
+core_initcall(clk_init);
 
 /*
  * CLCD support.