ACPI: Make FADT entries for RTC/CMOS architectural

For AMD, replace name RTC_ALT_CENTURY with RTC_CLK_ALTCENTURY
that points to same offset. Since the century field inside
RTC falls within the NVRAM space, and could interfere with
OPTION_TABLE, it is now guarded with config USE_PC_CMOS_ALTCENTURY.

There were no reference for the use of offset 0x48 for century.

Change-Id: I965a83dc8daaa02ad0935bdde5ca50110adb014a
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74601
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

src/soc/amd/stoneyridge/acpi.c

@@ -54,7 +54,6 @@ void acpi_fill_fadt(acpi_fadt_t *fadt)
 
 	fadt->duty_offset = 1;	/* CLK_VAL bits 3:1 */
 	fadt->duty_width = 3;	/* CLK_VAL bits 3:1 */
-	fadt->day_alrm = RTC_DATE_ALARM;
 	fadt->iapc_boot_arch = FADT_BOOT_ARCH;	/* See table 5-10 */
 	fadt->flags |= ACPI_FADT_WBINVD | /* See table 5-10 ACPI 3.0a spec */
 				ACPI_FADT_C1_SUPPORTED |

src/soc/amd/stoneyridge/include/soc/acpi.h

@@ -14,9 +14,6 @@
 	#define FADT_BOOT_ARCH (ACPI_FADT_LEGACY_DEVICES | ACPI_FADT_8042)
 #endif
 
-/* RTC Registers */
-#define RTC_DATE_ALARM		0x0d
-
 const char *soc_acpi_name(const struct device *dev);
 
 #endif /* AMD_STONEYRIDGE_ACPI_H */