powerpc/corenet_ds: Get rid of the CONFIG_SRIOBOOT_SLAVE_PORTx macro

When compile the slave image for boot from SRIO, no longer need to
specify which SRIO port it will boot from. The code will get this
information from RCW and then finishes corresponding configurations.

This has the following advantages:
	1. No longer need to rebuild an image when change the SRIO port for
	   boot from SRIO, just rewrite the new RCW with selected port,
	   then the code will get the port information by reading new RCW.
	2. It will be easier to support other boot location options, for
	   example, boot from PCIE.

Signed-off-by: Liu Gang <Gang.Liu@freescale.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>
diff --git a/arch/powerpc/include/asm/immap_85xx.h b/arch/powerpc/include/asm/immap_85xx.h
index 53d563e..91228e7 100644
--- a/arch/powerpc/include/asm/immap_85xx.h
+++ b/arch/powerpc/include/asm/immap_85xx.h
@@ -1758,6 +1758,7 @@
 #define FSL_CORENET_RCWSR5_DDR_SYNC		0x00000080
 #define FSL_CORENET_RCWSR5_DDR_SYNC_SHIFT		 7
 #define FSL_CORENET_RCWSR5_SRDS_EN		0x00002000
+#define FSL_CORENET_RCWSR6_BOOT_LOC	0x0f800000
 #define FSL_CORENET_RCWSRn_SRDS_LPD_B2		0x3c000000 /* bits 162..165 */
 #define FSL_CORENET_RCWSRn_SRDS_LPD_B3		0x003c0000 /* bits 170..173 */
 #define FSL_CORENET_RCWSR7_MCK_TO_PLAT_RAT	0x00400000