powerpc/mpc52xx_psc_spi: use linux/of_platform.h instead of asm

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

drivers/spi/mpc52xx_psc_spi.c

@@ -17,7 +17,7 @@
 #include <linux/interrupt.h>
 
 #if defined(CONFIG_PPC_MERGE)
-#include <asm/of_platform.h>
+#include <linux/of_platform.h>
 #else
 #include <linux/platform_device.h>
 #endif