lib/coreboot_table: add function to allow arch code to add records

Add lb_arch_add_records() to allow the architecture code to
generically hook into the coreboot table generation.

BUG=chrome-os-partner:50214
BRANCH=glados
TEST=With all subsequent patches confirmed lb_arch_add_records() is
     called when a strong symbol is provided.

Change-Id: I7c69c0ff0801392bbcf5aef586a48388b624afd4
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/13669
Tested-by: build bot (Jenkins)
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Andrey Petrov <andrey.petrov@intel.com>

src/arch/arm/tables.c

@@ -54,3 +54,7 @@ void write_tables(void)
 	/* Print CBMEM sections */
 	cbmem_list();
 }
+
+void lb_arch_add_records(struct lb_header *header)
+{
+}

src/arch/arm64/tables.c

@@ -54,3 +54,7 @@ void write_tables(void)
 	/* Print CBMEM sections */
 	cbmem_list();
 }
+
+void lb_arch_add_records(struct lb_header *header)
+{
+}

src/arch/mips/tables.c

@@ -55,3 +55,7 @@ void write_tables(void)
 	/* Print CBMEM sections */
 	cbmem_list();
 }
+
+void lb_arch_add_records(struct lb_header *header)
+{
+}

src/arch/riscv/tables.c

@@ -62,3 +62,7 @@ void write_tables(void)
 {
 	wtf_write_tables();
 }
+
+void lb_arch_add_records(struct lb_header *header)
+{
+}

src/arch/x86/cpu.c

@@ -11,6 +11,7 @@
  * GNU General Public License for more details.
  */
 
+#include <boot/coreboot_tables.h>
 #include <console/console.h>
 #include <cpu/cpu.h>
 #include <arch/io.h>
@@ -287,3 +288,7 @@ void cpu_initialize(unsigned int index)
 
 	return;
 }
+
+void lb_arch_add_records(struct lb_header *header)
+{
+}

src/include/boot/coreboot_tables.h

@@ -22,6 +22,9 @@ void lb_board(struct lb_header *header);
 /* Define this in soc or fsp driver to add specific table entries. */
 void lb_framebuffer(struct lb_header *header);
 
+/* Allow arch to add records. */
+void lb_arch_add_records(struct lb_header *header);
+
 /*
  * Function to retrieve MAC address(es) from the VPD and store them in the
  * coreboot table.

src/lib/coreboot_table.c

@@ -540,6 +540,9 @@ unsigned long write_coreboot_table(
 
 	lb_boot_media_params(head);
 
+	/* Add architecture records. */
+	lb_arch_add_records(head);
+
 	/* Add all cbmem entries into the coreboot tables. */
 	cbmem_add_records_to_cbtable(head);