Fix incorrect enum type used

No functional change as they both evaluate to the same
numerical value.

Change-Id: Ia84c19e08defa63067755389857c967698127d8c
diff --git a/src/ethosu_driver.c b/src/ethosu_driver.c
index b5e3973..cfff045 100644
--- a/src/ethosu_driver.c
+++ b/src/ethosu_driver.c
@@ -676,7 +676,7 @@
     {
         drv->power_request |= (1 << client);
     }
-    else if (power_request == ETHOSU_CLOCK_Q_ENABLE)
+    else if (power_request == ETHOSU_POWER_Q_ENABLE)
     {
         drv->power_request &= ~(1 << client);
     }