acpi,Makefile: Add preload_acpi_dsdt

This will allow us to preload the dsdt.aml file.

BUG=b:179699789
TEST=Build guybrush
| 80 - write tables                                   | 1.564     | 1.08      Δ( -0.48,   -0.03%) |
| 85 - finalize chips                                 | 15.483    | 13.543    Δ( -1.94,   -0.14%) |

Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: Ibf69ecb947811a2eec861018e3ba5f858155f1c3
Reviewed-on: https://review.coreboot.org/c/coreboot/+/59504
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
diff --git a/src/acpi/acpi.c b/src/acpi/acpi.c
index 78c3fd3..3bf57c6 100644
--- a/src/acpi/acpi.c
+++ b/src/acpi/acpi.c
@@ -1577,6 +1577,17 @@
 	return 0;
 }
 
+void preload_acpi_dsdt(void)
+{
+	const char *file = CONFIG_CBFS_PREFIX "/dsdt.aml";
+
+	if (!CONFIG(CBFS_PRELOAD))
+		return;
+
+	printk(BIOS_DEBUG, "Preloading %s\n", file);
+	cbfs_preload(file);
+}
+
 unsigned long write_acpi_tables(unsigned long start)
 {
 	unsigned long current;