powerpc: untangle cputable mce include

Having cputable.h include mce.h means it pulls in a bunch of low level
headers (e.g., synch.h) which then can't use CPU_FTR_ definitions.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200916030234.4110379-1-npiggin@gmail.com
diff --git a/arch/powerpc/kernel/dt_cpu_ftrs.c b/arch/powerpc/kernel/dt_cpu_ftrs.c
index f204ad7..1098863 100644
--- a/arch/powerpc/kernel/dt_cpu_ftrs.c
+++ b/arch/powerpc/kernel/dt_cpu_ftrs.c
@@ -17,6 +17,7 @@
 
 #include <asm/cputable.h>
 #include <asm/dt_cpu_ftrs.h>
+#include <asm/mce.h>
 #include <asm/mmu.h>
 #include <asm/oprofile_impl.h>
 #include <asm/prom.h>