SF: Remove conditional lock in setPowerMode

The mCurrentState access in setPowerModeInternal was only for looking up
the sequence ID of the display.

Bug: 74619554
Test: Boot
Change-Id: If0fad8f19bf8680f247476c3ffe52667e061fdd3
diff --git a/services/surfaceflinger/DisplayDevice.cpp b/services/surfaceflinger/DisplayDevice.cpp
index 2963a97..3ad07ae 100644
--- a/services/surfaceflinger/DisplayDevice.cpp
+++ b/services/surfaceflinger/DisplayDevice.cpp
@@ -222,6 +222,7 @@
       : lastCompositionHadVisibleLayers(false),
         mFlinger(args.flinger),
         mDisplayToken(args.displayToken),
+        mSequenceId(args.sequenceId),
         mId(args.displayId),
         mNativeWindow(args.nativeWindow),
         mGraphicBuffer(nullptr),