soc/amd/picasso,stoneyridge/acpi: use define for RTC_DATE_ALARM

Cezanne already uses a define for this and it's better to define and use
constants instead of magic values.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: Ifa4b3b3cdb161670128b284a3396fc5a85545608
Reviewed-on: https://review.coreboot.org/c/coreboot/+/59586
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
diff --git a/src/soc/amd/stoneyridge/acpi.c b/src/soc/amd/stoneyridge/acpi.c
index b2de89e..918ba5e 100644
--- a/src/soc/amd/stoneyridge/acpi.c
+++ b/src/soc/amd/stoneyridge/acpi.c
@@ -84,7 +84,7 @@
 	fadt->p_lvl3_lat = ACPI_FADT_C3_NOT_SUPPORTED;
 	fadt->duty_offset = 1;	/* CLK_VAL bits 3:1 */
 	fadt->duty_width = 3;	/* CLK_VAL bits 3:1 */
-	fadt->day_alrm = 0x0d;
+	fadt->day_alrm = RTC_DATE_ALARM;
 	fadt->mon_alrm = 0;	/* Not supported */
 	fadt->iapc_boot_arch = FADT_BOOT_ARCH;	/* See table 5-10 */
 	fadt->res2 = 0;		/* reserved, MUST be 0 ACPI 3.0 */