acpi: rename acpi_soc_fill_bert and add return value

The return value indicates if the function has found valid BERT data and
wrote them to the region and length parameters. This will be used in a
follow-up patch to remove the acpi_is_boot_error_src_present function
call in the common code.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: Iaaa3eed51645e1b3bc904c6279d171e3a10d59be
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55053
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Lance Zhao
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/include/acpi/acpi.h

@@ -1342,7 +1342,7 @@ unsigned long acpi_create_lpi_desc_ncst(acpi_lpi_desc_ncst_t *lpi_desc, uint16_t
 
 /* For crashlog. */
 bool acpi_is_boot_error_src_present(void);
-void acpi_soc_fill_bert(void **region, size_t *length);
+enum cb_err acpi_soc_get_bert_region(void **region, size_t *length);
 
 /* For ACPI S3 support. */
 void __noreturn acpi_resume(void *wake_vec);