ppc: qemu: Drop a custom env variable 'fdt_addr_r'

Now that we have switched to CONFIG_OF_CONTROL, and we can use the
env variable 'fdtcontroladdr' directly instead of creating one that
is duplicated.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/include/configs/qemu-ppce500.h b/include/configs/qemu-ppce500.h
index 7c65e64..b2e1204 100644
--- a/include/configs/qemu-ppce500.h
+++ b/include/configs/qemu-ppce500.h
@@ -106,6 +106,6 @@
 #define CONFIG_LOADADDR		1000000
 
 #define CONFIG_BOOTCOMMAND		\
-	"test -n \"$qemu_kernel_addr\" && bootm $qemu_kernel_addr - $fdt_addr_r\0"
+	"test -n \"$qemu_kernel_addr\" && bootm $qemu_kernel_addr - $fdtcontroladdr\0"
 
 #endif	/* __QEMU_PPCE500_H */