powerpc: Remove legacy iSeries bits from assembly files

This removes the various bits of assembly in the kernel entry,
exception handling and SLB management code that were specific
to running under the legacy iSeries hypervisor which is no
longer supported.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/kernel/vmlinux.lds.S

@@ -109,11 +109,6 @@ SECTIONS
 		__ptov_table_begin = .;
 		*(.ptov_fixup);
 		__ptov_table_end = .;
-#ifdef CONFIG_PPC_ISERIES
-		__dt_strings_start = .;
-		*(.dt_strings);
-		__dt_strings_end = .;
-#endif
 	}
 
 	.init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) {