staging: typec: tcpm: make function tcpm_get_pwr_opmode

The function pointer tcpm_get_pwr_opmode is local to the source and does
not need to be in global scope, so make it static.

Cleans up sparse warning:
symbol 'tcpm_get_pwr_opmode' was not declared. Should it be static?
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/typec/tcpm.c

@@ -2131,7 +2131,7 @@ static void tcpm_swap_complete(struct tcpm_port *port, int result)
 	}
 }
 
-enum typec_pwr_opmode tcpm_get_pwr_opmode(enum typec_cc_status cc)
+static enum typec_pwr_opmode tcpm_get_pwr_opmode(enum typec_cc_status cc)
 {
 	switch (cc) {
 	case TYPEC_CC_RP_1_5: