s390/decompressor: discard ___kcrctab section

___kcrctab section is not used during the decompressor phase and could be
discarded to save the memory. It is currently generated due to lib/mem.S
usage, which exports few symbols.

Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/boot/compressed/vmlinux.lds.S

@@ -58,5 +58,6 @@ SECTIONS
 		*(.eh_frame)
 		*(__ex_table)
 		*(*__ksymtab*)
+		*(___kcrctab*)
 	}
 }