util/ifdtool: Add FLMAP3 dump for Gen11 onwards PCH

BUG=b:153888802
TEST=Able to dump FLMAP3 for Volteer platform with TGP
> ifdtool -d coreboot.rom

FLMAP3:      0x00000000
  Minor Revision ID:     0x0000
  Major Revision ID:     0x0000

Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Change-Id: I681abd6ae7b87f6638d4f6dc59168cf22b93c787
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44818
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/util/ifdtool/ifdtool.h b/util/ifdtool/ifdtool.h
index a113d29..fb3de2f 100644
--- a/util/ifdtool/ifdtool.h
+++ b/util/ifdtool/ifdtool.h
@@ -81,6 +81,7 @@
 	uint32_t flmap0;
 	uint32_t flmap1;
 	uint32_t flmap2;
+	uint32_t flmap3; // Exist for 500 series onwards
 } __attribute__((packed)) fdbar_t;
 
 // regions