TI: Add, use a DEFAULT_LINUX_BOOT_ENV environment string

To deal with a reoccurring problem properly we need to specify addresses
for the Linux kernel, Flatted Device Tree and ramdisk that obey the
constraints within the kernel's Documentation/arm/Booting file but also
make sure that we relocate things within a valid address range.

It is possible with these addresses to also set fdt_high and initrd_high
to the value of 0xffffffff.  We don't do this by default to allow for
the most likely success of people using custom addresses however.

Signed-off-by: Tom Rini <trini@ti.com>
diff --git a/include/configs/ti_omap4_common.h b/include/configs/ti_omap4_common.h
index bcb5eab..387f570 100644
--- a/include/configs/ti_omap4_common.h
+++ b/include/configs/ti_omap4_common.h
@@ -87,10 +87,8 @@
  * Environment setup
  */
 #define CONFIG_EXTRA_ENV_SETTINGS \
-	"loadaddr=0x82000000\0" \
+	DEFAULT_LINUX_BOOT_ENV \
 	"console=ttyO2,115200n8\0" \
-	"fdt_high=0xffffffff\0" \
-	"fdtaddr=0x80f80000\0" \
 	"fdtfile=undefined\0" \
 	"bootpart=0:2\0" \
 	"bootdir=/boot\0" \