Rename the kernel folder name to kernel_imx for Freescale.

Bug: 26810802

Freescale always uses "kernel_imx" as the folder name for kernel,
then userspace will always reference it.

Change-Id: Id35c4e133074b12815449d882286f8ead62a16ec
diff --git a/default.xml b/default.xml
index 3b3b55c..e76db22 100644
--- a/default.xml
+++ b/default.xml
@@ -233,7 +233,7 @@
   <project path="hardware/bsp/freescale"
            name="platform/hardware/bsp/freescale"
            groups="picoimx" />
-  <project path="hardware/bsp/kernel/freescale/picoimx-3.14"
+  <project path="hardware/bsp/kernel/freescale/kernel_imx"
            name="platform/hardware/bsp/kernel/freescale"
            groups="picoimx" />
   <!-- END starter boards -->