clk: ti: Force pointer to be __iomem

Add __force here so that sparse doesn't complain about us playing
tricks with __iomem.
Acked-by: NTero Kristo <t-kristo@ti.com>
Signed-off-by: NStephen Boyd <sboyd@codeaurora.org>

drivers/clk/ti/clk.c

@@ -193,7 +193,7 @@ void __iomem *ti_clk_get_reg_addr(struct device_node *node, int index)
 
 	reg->offset = val;
 
-	return (void __iomem *)tmp;
+	return (__force void __iomem *)tmp;
 }
 
 /**