ARM: OMAP: Make plat-omap/i2c.c port checks local

The common code should not have any omap1 or omap2+
specific code, and should not need to call the cpu_is_omap
macros.

The only remaining user for cpu_is_omap macros is
omap_i2c_nr_ports(). Let's make those checks in
the omap specific implementation of omap_i2c_add_bus()
instead in order to remove cpu_is_omap usage from
the common code.

Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap1/i2c.c

@@ -54,6 +54,9 @@ int __init omap_i2c_add_bus(struct omap_i2c_bus_platform_data *pdata,
 	struct platform_device *pdev;
 	struct resource *res;
 
+	if (bus_id > 1)
+		return -EINVAL;
+
 	omap1_i2c_mux_pins(bus_id);
 
 	pdev = &omap_i2c_devices[bus_id - 1];