ahci-plat: Provide a weak scsi_init hook

This allow the platform to register the platform ahci device.
Signed-off-by: NIan Campbell <ijc@hellion.org.uk>

arch/arm/lib/board.c

@@ -33,6 +33,7 @@
 #include <nand.h>
 #include <onenand_uboot.h>
 #include <mmc.h>
+#include <scsi.h>
 #include <libfdt.h>
 #include <fdtdec.h>
 #include <post.h>
@@ -593,6 +594,11 @@ void board_init_r(gd_t *id, ulong dest_addr)
 	mmc_initialize(gd->bd);
 #endif
 
+#ifdef CONFIG_CMD_SCSI
+	puts("SCSI:  ");
+	scsi_init();
+#endif
+
 #ifdef CONFIG_HAS_DATAFLASH
 	AT91F_DataflashInit();
 	dataflash_print_info();

drivers/block/ahci.c

@@ -930,6 +930,11 @@ int ahci_init(u32 base)
 err_out:
 	return rc;
 }
+
+void __weak scsi_init(void)
+{
+}
+
 #endif
 
 /*