Move FVP power driver to FVP platform

Move the FVP power driver to a directory under the FVP platform
port as this is not a generically usable driver.

Change-Id: Ibc78bd88752eb3e3964336741488349ac345f4f0
diff --git a/plat/fvp/plat_topology.c b/plat/fvp/plat_topology.c
index 0c8c525..765077e 100644
--- a/plat/fvp/plat_topology.c
+++ b/plat/fvp/plat_topology.c
@@ -31,9 +31,9 @@
 #include <string.h>
 #include <assert.h>
 #include <platform.h>
-#include <fvp_pwrc.h>
 /* TODO: Reusing psci error codes & state information. Get our own! */
 #include <psci.h>
+#include "drivers/pwrc/fvp_pwrc.h"
 
 /* We treat '255' as an invalid affinity instance */
 #define AFFINST_INVAL	0xff