ARM: OMAP: Remove plat-omap/common.h

Most of the prototypes in plat-omap/common.h are not
common to omap1 and omap2+, they are local to omap2+
and should not be in plat-omap/common.h.

The only shared function prototype in this file is
omap_init_clocksource_32k(), let's put that into
counter-32k.h.

Note that the new plat/counter-32k.h must not be
included from drivers, that will break omap2+ build
for CONFIG_MULTIPLATFORM.

Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c
index 95e4478..c5bc2cb 100644
--- a/arch/arm/mach-omap2/timer.c
+++ b/arch/arm/mach-omap2/timer.c
@@ -45,6 +45,7 @@
 #include <asm/arch_timer.h>
 #include "omap_hwmod.h"
 #include "omap_device.h"
+#include <plat/counter-32k.h>
 #include <plat/dmtimer.h>
 #include "omap-pm.h"