USB: typec: tcpci: Add Bleed discharge to POWER_CONTROL definition

"Table 4-19. POWER_CONTROL Register Definition" from tcpci spec
defines BIT(3) as the control bit for bleed discharge.

Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Kyle Tso <kyletso@google.com>
Reviewed-by: NGuenter Roeck <linux@roeck-us.net>
Acked-by: NHeikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: NBadhri Jagan Sridharan <badhri@google.com>
Signed-off-by: NWill McVicker <willmcvicker@google.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20201210160521.3417426-6-gregkh@linuxfoundation.orgSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/typec/tcpm/tcpci.h

@@ -72,6 +72,7 @@
 
 #define TCPC_POWER_CTRL			0x1c
 #define TCPC_POWER_CTRL_VCONN_ENABLE	BIT(0)
+#define TCPC_POWER_CTRL_BLEED_DISCHARGE	BIT(3)
 #define TCPC_POWER_CTRL_AUTO_DISCHARGE	BIT(4)
 #define TCPC_FAST_ROLE_SWAP_EN		BIT(7)