usb: typec: tcpci: Make symbol 'tcpci_apply_rc' static

The sparse tool complains as follows:

drivers/usb/typec/tcpm/tcpci.c:118:5: warning:
 symbol 'tcpci_apply_rc' was not declared. Should it be static?

This symbol is not used outside of tcpci.c, so marks it static.

Fixes: 7257fbc7 ("usb: typec: tcpci: Implement callback for apply_rc")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Link: https://lore.kernel.org/r/20210524133704.2432555-1-weiyongjun1@huawei.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/typec/tcpm/tcpci.c

@@ -115,7 +115,8 @@ static int tcpci_set_cc(struct tcpc_dev *tcpc, enum typec_cc_status cc)
 	return 0;
 }
 
-int tcpci_apply_rc(struct tcpc_dev *tcpc, enum typec_cc_status cc, enum typec_cc_polarity polarity)
+static int tcpci_apply_rc(struct tcpc_dev *tcpc, enum typec_cc_status cc,
+			  enum typec_cc_polarity polarity)
 {
 	struct tcpci *tcpci = tcpc_to_tcpci(tcpc);
 	unsigned int reg;