tty: n_smux: Remove unused power bit

Remove power control bit that is no longer used and is no longer part of
the SMUX protocol.

Change-Id: I727eb7d848d5298c146919f2299a86d17643253f
Signed-off-by: Eric Holmberg <eholmber@codeaurora.org>
diff --git a/drivers/tty/smux_loopback.c b/drivers/tty/smux_loopback.c
index 52ce17f..bf6d50b 100644
--- a/drivers/tty/smux_loopback.c
+++ b/drivers/tty/smux_loopback.c
@@ -262,8 +262,7 @@
 			smux_init_pkt(&reply_pkt);
 			reply_pkt.hdr.lcid = lcid;
 			reply_pkt.hdr.cmd = SMUX_CMD_PWR_CTL;
-			reply_pkt.hdr.flags = SMUX_CMD_PWR_CTL_SLEEP_REQ
-				| SMUX_CMD_PWR_CTL_ACK;
+			reply_pkt.hdr.flags = SMUX_CMD_PWR_CTL_ACK;
 			reply_pkt.hdr.payload_len = 0;
 			reply_pkt.payload = NULL;
 			reply_pkt.hdr.pad_len = pkt->hdr.pad_len;