sysinfo: Get rid of the unused n_memranges member.

Change-Id: Id090bf9dde4da88c405171d0cc8a05d5e581d223
diff --git a/src/libpayload/include/sysinfo.h b/src/libpayload/include/sysinfo.h
index d24b155..ef891eb 100644
--- a/src/libpayload/include/sysinfo.h
+++ b/src/libpayload/include/sysinfo.h
@@ -31,8 +31,6 @@
 #include <coreboot_tables.h>
 
 struct sysinfo_t {
-	int n_memranges;
-
 	uint32_t vbnv_start;
 	uint32_t vbnv_size;