soc/amd/picasso,stoneyridge/acpi: drop unneeded ARM_boot_arch assignment

The FADT data structure is zero-initialized in acpi_create_fadt which
then calls the SoC-specific acpi_fill_fadt function, therefore it's not
needed to assign 0 to the ARM_boot_arch FADT field in acpi_fill_fadt.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: Ica968db1228a2d63e83f2b6c4ea57c5f02bf1504
Reviewed-on: https://review.coreboot.org/c/coreboot/+/73187
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Fred Reitberger <reitbergerfred@gmail.com>
diff --git a/src/soc/amd/picasso/acpi.c b/src/soc/amd/picasso/acpi.c
index 48b56f5..125aa0a 100644
--- a/src/soc/amd/picasso/acpi.c
+++ b/src/soc/amd/picasso/acpi.c
@@ -100,8 +100,6 @@
 			ACPI_FADT_REMOTE_POWER_ON;
 	fadt->flags |= cfg->fadt_flags; /* additional board-specific flags */
 
-	fadt->ARM_boot_arch = 0;	/* Must be zero if ACPI Revision <= 5.0 */
-
 	fadt->x_firmware_ctl_l = 0;	/* set to 0 if firmware_ctrl is used */
 	fadt->x_firmware_ctl_h = 0;
 }
diff --git a/src/soc/amd/stoneyridge/acpi.c b/src/soc/amd/stoneyridge/acpi.c
index be9349d..40976af 100644
--- a/src/soc/amd/stoneyridge/acpi.c
+++ b/src/soc/amd/stoneyridge/acpi.c
@@ -91,8 +91,6 @@
 				ACPI_FADT_S4_RTC_VALID |
 				ACPI_FADT_REMOTE_POWER_ON;
 
-	fadt->ARM_boot_arch = 0;	/* Must be zero if ACPI Revision <= 5.0 */
-
 	fadt->x_firmware_ctl_l = 0;	/* set to 0 if firmware_ctrl is used */
 	fadt->x_firmware_ctl_h = 0;
 }