arm/link: Remove exception table sections

This was almost certainly copy&paste from x86.  ARM does not us these nor
selects HAS_EX_TABLE, so drop the sections and their boundary markers.

No functional change.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Julien Grall <jgrall@amazon.com>

xen/arch/arm/xen.lds.S

@@ -86,16 +86,6 @@ SECTIONS
   } : text
 
   .data.read_mostly : {
-       /* Exception table */
-       __start___ex_table = .;
-       *(.ex_table)
-       __stop___ex_table = .;
-
-       /* Pre-exception table */
-       __start___pre_ex_table = .;
-       *(.ex_table.pre)
-       __stop___pre_ex_table = .;
-
        *(.data.read_mostly)
   } :text