Consolidate mpc8260 linker scripts

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
diff --git a/board/cogent/config.mk b/board/cogent/config.mk
index ee77939..35a5ed3 100644
--- a/board/cogent/config.mk
+++ b/board/cogent/config.mk
@@ -29,3 +29,5 @@
 TEXT_BASE = 0xfff00000
 
 PLATFORM_CPPFLAGS += -DTEXT_BASE=$(TEXT_BASE) -I$(TOPDIR)
+
+LDSCRIPT := $(SRCTREE)/board/cogent/u-boot.lds
diff --git a/board/hymod/config.mk b/board/hymod/config.mk
index 0a9985f..2df321f 100644
--- a/board/hymod/config.mk
+++ b/board/hymod/config.mk
@@ -30,3 +30,5 @@
 PLATFORM_CPPFLAGS += -I$(TOPDIR)
 
 OBJCFLAGS = --remove-section=.ppcenv
+
+LDSCRIPT := $(SRCTREE)/board/hymod/u-boot.lds
diff --git a/board/rsdproto/config.mk b/board/rsdproto/config.mk
index 5844ec1..35c3d8c 100644
--- a/board/rsdproto/config.mk
+++ b/board/rsdproto/config.mk
@@ -31,3 +31,5 @@
 
 TEXT_BASE = 0xff000000
 /*TEXT_BASE  = 0x00200000 */
+
+LDSCRIPT := $(SRCTREE)/board/rsdproto/u-boot.lds