lib/version: Move board identification strings

These strings are now only expanded in lib/identity.c.

This improves ccache hit rates slightly, as one built object file
lib/version.o is used for all variants of a board. Also one built
object file lib/identity.o can become a ccache hit for successive
builds of a variant, while the commit hash changes.

Change-Id: Ia7d5454d95c8698ab1c1744e63ea4c04d615bb3b
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74449
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
diff --git a/util/sconfig/main.c b/util/sconfig/main.c
index aa79f1e..a246c01 100644
--- a/util/sconfig/main.c
+++ b/util/sconfig/main.c
@@ -1965,6 +1965,7 @@
 	fprintf(f, "#include <device/device.h>\n");
 	fprintf(f, "#include <device/pci.h>\n");
 	fprintf(f, "#include <fw_config.h>\n");
+	fprintf(f, "#include <identity.h>\n");
 	fprintf(f, "#include <%s>\n", static_header);
 	emit_chip_headers(f, chip_header.next);
 	emit_identifiers(f, "struct device_operations", device_operations);