rtc: ab-eoz9: set regmap max_register

Set regmap's max_register property to allow users to dump registers
using debufgs.

Signed-off-by: Liam Beguin <[e-mail]>
Signed-off-by: Alexandre Belloni <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/rtc/rtc-ab-eoz9.c

···
 static const struct regmap_config abeoz9_rtc_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,
+	.max_register = 0x3f,
 };
 
 #if IS_REACHABLE(CONFIG_HWMON)