clk: renesas: rcar-gen2: Change multipliers and dividers to u8

All multipliers and dividers are small.
Storing them in u8 instead of unsigned int reduces kernel size for a
generic kernel by ca. 0.5 KiB.

Signed-off-by: Geert Uytterhoeven <[e-mail]>
Reviewed-by: Niklas Söderlund <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/clk/renesas/rcar-gen2-cpg.h

···
 };
 
 struct rcar_gen2_cpg_pll_config {
-	unsigned int extal_div;
-	unsigned int pll1_mult;
-	unsigned int pll3_mult;
-	unsigned int pll0_mult;		/* leave as zero if PLL0CR exists */
+	u8 extal_div;
+	u8 pll1_mult;
+	u8 pll3_mult;
+	u8 pll0_mult;		/* leave as zero if PLL0CR exists */
 };
 
 struct clk *rcar_gen2_cpg_clk_register(struct device *dev,