Fix linker scripts: add NOLOAD atribute to .bss/.sbss sections

With recent toolchain versions, some boards would not build because
or errors like this one (here for ocotea board when building with
ELDK 4.2 beta):
ppc_4xx-ld: section .bootpg [fffff000 -> fffff23b] overlaps section .bss [fffee900 -> fffff8ab]

For many boards, the .bss section is big enough that it wraps around
at the end of the address space (0xFFFFFFFF), so the problem will not
be visible unless you use a 64 bit tool chain for development. On
some boards however, changes to the code size (due to different
optimizations) we bail out with section overlaps like above.

The fix is to add the NOLOAD attribute to the .bss and .sbss
sections, telling the linker that .bss does not consume any space in
the image.

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/nand_spl/board/amcc/acadia/u-boot.lds b/nand_spl/board/amcc/acadia/u-boot.lds
index a07a773..7df55e7 100644
--- a/nand_spl/board/amcc/acadia/u-boot.lds
+++ b/nand_spl/board/amcc/acadia/u-boot.lds
@@ -53,7 +53,7 @@
   _edata  =  .;
 
   __bss_start = .;
-  .bss       :
+  .bss (NOLOAD)       :
   {
    *(.sbss)
    *(.bss)
diff --git a/nand_spl/board/amcc/bamboo/u-boot.lds b/nand_spl/board/amcc/bamboo/u-boot.lds
index 28228f8..9dfca69 100644
--- a/nand_spl/board/amcc/bamboo/u-boot.lds
+++ b/nand_spl/board/amcc/bamboo/u-boot.lds
@@ -55,7 +55,7 @@
   _edata  =  .;
 
   __bss_start = .;
-  .bss       :
+  .bss (NOLOAD)       :
   {
    *(.sbss)
    *(.bss)
diff --git a/nand_spl/board/amcc/kilauea/u-boot.lds b/nand_spl/board/amcc/kilauea/u-boot.lds
index 24df32d..084db08 100644
--- a/nand_spl/board/amcc/kilauea/u-boot.lds
+++ b/nand_spl/board/amcc/kilauea/u-boot.lds
@@ -54,7 +54,7 @@
   _edata  =  .;
 
   __bss_start = .;
-  .bss       :
+  .bss (NOLOAD)       :
   {
    *(.sbss)
    *(.bss)
diff --git a/nand_spl/board/amcc/sequoia/u-boot.lds b/nand_spl/board/amcc/sequoia/u-boot.lds
index 1563689..0645ee7 100644
--- a/nand_spl/board/amcc/sequoia/u-boot.lds
+++ b/nand_spl/board/amcc/sequoia/u-boot.lds
@@ -55,7 +55,7 @@
   _edata  =  .;
 
   __bss_start = .;
-  .bss       :
+  .bss (NOLOAD)       :
   {
    *(.sbss)
    *(.bss)