Migrate CUSTOM_SYS_INIT_SP_ADDR to Kconfig using system-constants.h

- Make all users of CUSTOM_SYS_INIT_SP_ADDR reference SYS_INIT_SP_ADDR
- Introduce HAS_CUSTOM_SYS_INIT_SP_ADDR to allow for setting the stack
  pointer directly, otherwise we use the common calculation.
- On some platforms that were using the standard calculation but did not
  set CONFIG_SYS_INIT_RAM_SIZE / CONFIG_SYS_INIT_RAM_ADDR, set them.
- On a small number of platforms that were not subtracting
  GENERATED_GBL_DATA_SIZE do so now via the standard calculation.
- CONFIG_SYS_INIT_SP_OFFSET is now widely unused, so remove it from most
  board config header files.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/powerpc/cpu/mpc83xx/cpu_init.c b/arch/powerpc/cpu/mpc83xx/cpu_init.c
index b2b259b..e3e1bfd 100644
--- a/arch/powerpc/cpu/mpc83xx/cpu_init.c
+++ b/arch/powerpc/cpu/mpc83xx/cpu_init.c
@@ -6,6 +6,7 @@
 #include <common.h>
 #include <asm-offsets.h>
 #include <mpc83xx.h>
+#include <system-constants.h>
 #include <ioports.h>
 #include <asm/global_data.h>
 #include <asm/io.h>
@@ -138,7 +139,7 @@
 		0;
 
 	/* Pointer is writable since we allocated a register for it */
-	gd = (gd_t *)CONFIG_SYS_INIT_SP_ADDR;
+	gd = (gd_t *)SYS_INIT_SP_ADDR;
 
 	/* global data region was cleared in start.S */
 
diff --git a/arch/powerpc/cpu/mpc83xx/spl_minimal.c b/arch/powerpc/cpu/mpc83xx/spl_minimal.c
index 6d4655f..d8f6cfe 100644
--- a/arch/powerpc/cpu/mpc83xx/spl_minimal.c
+++ b/arch/powerpc/cpu/mpc83xx/spl_minimal.c
@@ -7,6 +7,7 @@
 #include <asm-offsets.h>
 #include <clock_legacy.h>
 #include <mpc83xx.h>
+#include <system-constants.h>
 #include <time.h>
 #include <asm/global_data.h>
 
@@ -25,7 +26,7 @@
 void cpu_init_f (volatile immap_t * im)
 {
 	/* Pointer is writable since we allocated a register for it */
-	gd = (gd_t *)CONFIG_SYS_INIT_SP_ADDR;
+	gd = (gd_t *)SYS_INIT_SP_ADDR;
 
 	/* global data region was cleared in start.S */
 
diff --git a/arch/powerpc/cpu/mpc83xx/start.S b/arch/powerpc/cpu/mpc83xx/start.S
index b136456..8a351b9 100644
--- a/arch/powerpc/cpu/mpc83xx/start.S
+++ b/arch/powerpc/cpu/mpc83xx/start.S
@@ -13,6 +13,7 @@
 #include <asm-offsets.h>
 #include <config.h>
 #include <mpc83xx.h>
+#include <system-constants.h>
 
 #include <ppc_asm.tmpl>
 #include <ppc_defs.h>
@@ -229,8 +230,8 @@
 	/* set up the stack pointer in our newly created
 	 * cache-ram; use r3 to keep the new SP for now to
 	 * avoid overiding the SP it uselessly */
-	lis	r3, CONFIG_SYS_INIT_SP_ADDR@h
-	ori	r3, r3, CONFIG_SYS_INIT_SP_ADDR@l
+	lis	r3, SYS_INIT_SP_ADDR@h
+	ori	r3, r3, SYS_INIT_SP_ADDR@l
 
 	/* r4 = end of GD area */
 	addi r4, r3, GENERATED_GBL_DATA_SIZE