ppc4xx: Move ppc4xx specific prototypes to ppc4xx header

This patch moves some 4xx specific prototypes out of include common.h
to a ppc4xx specific header.

Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/include/asm-ppc/ppc4xx-sdram.h b/include/asm-ppc/ppc4xx-sdram.h
index a1ef029..8efa557 100644
--- a/include/asm-ppc/ppc4xx-sdram.h
+++ b/include/asm-ppc/ppc4xx-sdram.h
@@ -1402,4 +1402,18 @@
 
 #endif /* CONFIG_SDRAM_PPC4xx_DENALI_DDR2 */
 
+#ifndef __ASSEMBLY__
+/*
+ * Prototypes
+ */
+void inline blank_string(int size);
+inline void ppc4xx_ibm_ddr2_register_dump(void);
+u32 mfdcr_any(u32);
+void mtdcr_any(u32, u32);
+u32 ddr_wrdtr(u32);
+u32 ddr_clktr(u32);
+void spd_ddr_init_hang(void);
+u32 DQS_autocalibration(void);
+#endif /* __ASSEMBLY__ */
+
 #endif /* _PPC4xx_SDRAM_H_ */