[POWERPC] bootwrapper: Allow wrapper script to execute verbosely

Allow wrapper script to print verbose progress when the V is set in the
environment.
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>
Acked-by: NDavid Gibson <david@gibson.dropbear.id.au>
Signed-off-by: NJosh Boyer <jwboyer@linux.vnet.ibm.com>

arch/powerpc/boot/wrapper

@@ -21,6 +21,11 @@
 #		(default ./arch/powerpc/boot)
 # -W dir	specify working directory for temporary files (default .)
 
+# Allow for verbose output
+if [ "$V" = 1 ]; then
+    set -x
+fi
+
 # defaults
 kernel=
 ofile=zImage