staging: vt6655: Replace C99 comments in power.c and upc.h.

This patch fixes the following checkpatch.pl warnings:

ERROR: do not use C99 // comments
+//

ERROR: do not use C99 // comments
+//  For memory mapped IO

ERROR: do not use C99 // comments
+//

ERROR: do not use C99 // comments
+#endif // __UPC_H__

ERROR: do not use C99 // comments
+	// set period of power up before TBTT

ERROR: do not use C99 // comments
+		// set AID

ERROR: do not use C99 // comments
+		// set ATIM Window

ERROR: do not use C99 // comments
+	// Set AutoSleep

ERROR: do not use C99 // comments
+	// Set HWUTSF

ERROR: do not use C99 // comments
+		// clear always listen beacon

ERROR: do not use C99 // comments
+		// first time set listen next beacon

ERROR: do not use C99 // comments
+		// always listen beacon

ERROR: do not use C99 // comments
+	// enable power saving hw function

ERROR: do not use C99 // comments
+	// disable power saving hw function

ERROR: do not use C99 // comments
+	//clear AutoSleep

ERROR: do not use C99 // comments
+	//clear HWUTSF

ERROR: do not use C99 // comments
+	// set always listen beacon

Signed-off-by: Nicholas Parkanyi <n.parkanyi@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>