security/vboot: Remove redundent _verstage/_everstage/_verstage_size symbols

All those symbols are part of /include/symbols.h file hence
removing from /security/vboot/symbols.h

Change-Id: Id968186e28d6b772a1a6bca200a852407324d6e3
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/26274
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
diff --git a/src/security/vboot/symbols.h b/src/security/vboot/symbols.h
index fb3d654..ddf9d95 100644
--- a/src/security/vboot/symbols.h
+++ b/src/security/vboot/symbols.h
@@ -20,9 +20,4 @@
 extern u8 _evboot2_work[];
 #define _vboot2_work_size (_evboot2_work - _vboot2_work)
 
-/* Careful: _e<stage> and _<stage>_size only defined for the current stage! */
-extern u8 _verstage[];
-extern u8 _everstage[];
-#define _verstage_size (_everstage - _verstage)
-
 #endif /* __VBOOT_SYMBOLS_H__ */