pinctrl: renesas: r8a77970: Use shorthands for reserved fields

Replace the full descriptions of reserved register fields by shorthands
with a negative field width, and merge adjacent reserved fields.

This reduces kernel size by 164 bytes.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/f2dda82454bb1b0c97f842de2c9fa68da05ef3e6.1649865241.git.geert+renesas@glider.be

drivers/pinctrl/renesas/pfc-r8a77970.c

@@ -2390,19 +2390,9 @@ static const struct pinmux_cfg_reg pinmux_config_regs[] = {
 #define F_(x, y)	x,
 #define FM(x)		FN_##x,
 	{ PINMUX_CFG_REG_VAR("MOD_SEL0", 0xe6060500, 32,
-			     GROUP(4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1,
-				   1, 1, 1, 1, 1),
+			     GROUP(-20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1),
 			     GROUP(
-		/* RESERVED 31, 30, 29, 28 */
-		0, 0, 0, 0, 0, 0, 0, 0,	0, 0, 0, 0, 0, 0, 0, 0,
-		/* RESERVED 27, 26, 25, 24 */
-		0, 0, 0, 0, 0, 0, 0, 0,	0, 0, 0, 0, 0, 0, 0, 0,
-		/* RESERVED 23, 22, 21, 20 */
-		0, 0, 0, 0, 0, 0, 0, 0,	0, 0, 0, 0, 0, 0, 0, 0,
-		/* RESERVED 19, 18, 17, 16 */
-		0, 0, 0, 0, 0, 0, 0, 0,	0, 0, 0, 0, 0, 0, 0, 0,
-		/* RESERVED 15, 14, 13, 12 */
-		0, 0, 0, 0, 0, 0, 0, 0,	0, 0, 0, 0, 0, 0, 0, 0,
+		/* RESERVED 31-12 */
 		MOD_SEL0_11
 		MOD_SEL0_10
 		MOD_SEL0_9