Kerneldoc expects arg descriptions to be in the format '@.*: '.  If either
the '@' or the ':' is omitted then kerneldoc complains that the description
is missing.  Add the missing ':'s here.

Also provide a new description for 'event'.

Fixes the following kernel build W=1 warnings:

 drivers/usb/phy/phy.c:106: warning: Function parameter or member 'work' not described in 'usb_phy_notify_charger_work'
 drivers/usb/phy/phy.c:172: warning: Function parameter or member 'nb' not described in 'usb_phy_get_charger_type'
 drivers/usb/phy/phy.c:172: warning: Function parameter or member 'state' not described in 'usb_phy_get_charger_type'
 drivers/usb/phy/phy.c:172: warning: Function parameter or member 'data' not described in 'usb_phy_get_charger_type'
 drivers/usb/phy/phy.c:194: warning: Function parameter or member 'usb_phy' not described in 'usb_phy_set_charger_current'
 drivers/usb/phy/phy.c:194: warning: Function parameter or member 'mA' not described in 'usb_phy_set_charger_current'
 drivers/usb/phy/phy.c:244: warning: Function parameter or member 'usb_phy' not described in 'usb_phy_get_charger_current'
 drivers/usb/phy/phy.c:244: warning: Function parameter or member 'min' not described in 'usb_phy_get_charger_current'
 drivers/usb/phy/phy.c:244: warning: Function parameter or member 'max' not described in 'usb_phy_get_charger_current'
 drivers/usb/phy/phy.c:281: warning: Function parameter or member 'usb_phy' not described in 'usb_phy_set_charger_state'
 drivers/usb/phy/phy.c:281: warning: Function parameter or member 'state' not described in 'usb_phy_set_charger_state'
 drivers/usb/phy/phy.c:427: warning: Function parameter or member 'dev' not described in 'devm_usb_get_phy'
 drivers/usb/phy/phy.c:427: warning: Function parameter or member 'type' not described in 'devm_usb_get_phy'
 drivers/usb/phy/phy.c:456: warning: Function parameter or member 'type' not described in 'usb_get_phy'
 drivers/usb/phy/phy.c:500: warning: Function parameter or member 'dev' not described in 'devm_usb_get_phy_by_node'
 drivers/usb/phy/phy.c:500: warning: Function parameter or member 'node' not described in 'devm_usb_get_phy_by_node'
 drivers/usb/phy/phy.c:500: warning: Function parameter or member 'nb' not described in 'devm_usb_get_phy_by_node'
 drivers/usb/phy/phy.c:558: warning: Function parameter or member 'dev' not described in 'devm_usb_get_phy_by_phandle'
 drivers/usb/phy/phy.c:558: warning: Function parameter or member 'phandle' not described in 'devm_usb_get_phy_by_phandle'
 drivers/usb/phy/phy.c:558: warning: Function parameter or member 'index' not described in 'devm_usb_get_phy_by_phandle'
 drivers/usb/phy/phy.c:590: warning: Function parameter or member 'dev' not described in 'devm_usb_put_phy'
 drivers/usb/phy/phy.c:590: warning: Function parameter or member 'phy' not described in 'devm_usb_put_phy'
 drivers/usb/phy/phy.c:627: warning: Function parameter or member 'type' not described in 'usb_add_phy'
 drivers/usb/phy/phy.c:721: warning: Function parameter or member 'event' not described in 'usb_phy_set_event'

Cc: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20200702144625.2533530-2-lee.jones@linaro.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>