powerpc/44x: Add explicit support for AMCC Glacier

Add explicit support for the AMCC Glacier eval board to Kconfig and the
ppc44x_simple file.  Also removes the cayonlands compatible entry from the
DTS file.

Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
diff --git a/arch/powerpc/boot/dts/glacier.dts b/arch/powerpc/boot/dts/glacier.dts
index 24cf0db..f3787a2 100644
--- a/arch/powerpc/boot/dts/glacier.dts
+++ b/arch/powerpc/boot/dts/glacier.dts
@@ -14,7 +14,7 @@
 	#address-cells = <2>;
 	#size-cells = <1>;
 	model = "amcc,glacier";
-	compatible = "amcc,glacier", "amcc,canyonlands";
+	compatible = "amcc,glacier";
 	dcr-parent = <&{/cpus/cpu@0}>;
 
 	aliases {