clk: renesas: rcar-gen3: Make cpg_z_clk.mask u32

cpg_z_clk.mask contains a mask for a 32-bit register.
Hence its size can be reduced from unsigned long to u32.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Stephen Boyd <sboyd@kernel.org>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Tested-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Link: https://lore.kernel.org/r/20210326120100.1577596-3-geert+renesas@glider.be

drivers/clk/renesas/rcar-gen3-cpg.c

@@ -50,8 +50,8 @@ struct cpg_z_clk {
 	struct clk_hw hw;
 	void __iomem *reg;
 	void __iomem *kick_reg;
-	unsigned long mask;
 	unsigned int fixed_div;
+	u32 mask;
 };
 
 #define to_z_clk(_hw)	container_of(_hw, struct cpg_z_clk, hw)