common: Move upmconfig() to ppc.h

This file is only used by PowerPC so move it to an arch-specific header
file.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/powerpc/include/asm/ppc.h b/arch/powerpc/include/asm/ppc.h
index 5765f6b..055364c 100644
--- a/arch/powerpc/include/asm/ppc.h
+++ b/arch/powerpc/include/asm/ppc.h
@@ -121,6 +121,7 @@
 void interrupt_init_cpu(unsigned *);
 void timer_interrupt_cpu(struct pt_regs *);
 unsigned long search_exception_table(unsigned long addr);
+void upmconfig(uint upm, uint *table, uint size);
 
 #endif /* !__ASSEMBLY__ */