Add eh_frame to rom section to fix compilation of coreboot with gcc 4.6

Change-Id: I347dd84a61244eed145c02a080309d5a34c5394a
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/263
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>

src/arch/x86/init/bootblock.ld

@@ -39,6 +39,7 @@ SECTIONS
 		*(.rodata);
 		*(.rodata.*);
 		*(.rom.data.*);
+		*(.eh_frame);
 		. = ALIGN(16);
 		_erom = .;
 	}