add uImage kernel-imagetype for fsp2

in a63de4a41 uimage class was added for fsp2 board
but that was not enough to make an uImage binary.

Signed-off-by: Ivan Mikhaylov <ivan@de.ibm.com>
Change-Id: I605ce5a5f78a6b3f98429e2eaae9457811e8e506
diff --git a/meta-fsp2/recipes-kernel/linux/linux-fsp2.inc b/meta-fsp2/recipes-kernel/linux/linux-fsp2.inc
index 23ecc45..2eb7f58 100644
--- a/meta-fsp2/recipes-kernel/linux/linux-fsp2.inc
+++ b/meta-fsp2/recipes-kernel/linux/linux-fsp2.inc
@@ -13,6 +13,7 @@
 
 COMPATIBLE_MACHINE_${MACHINE} = "^${MACHINE}$"
 KERNEL_CLASSES ?= "kernel-uimage"
+KERNEL_IMAGETYPE ?= "uImage"
 
 do_patch_append() {
     for DTB in "${KERNEL_DEVICETREE}"; do