pinctrl: rza1: Demote some kerneldoc headers and fix others

pinctrl: rza1: Demote some kerneldoc headers and fix others

Some description blocks are void of any description/documentation,
others are missing 'struct' identifiers, there are also a couple of
misspellings of function parameter names.  Fix all of them.

Fixes the following W=1 kernel build warning(s):

 drivers/pinctrl/pinctrl-rza1.c:81: warning: cannot understand function prototype: 'struct rza1_bidir_pin '
 drivers/pinctrl/pinctrl-rza1.c:90: warning: cannot understand function prototype: 'struct rza1_bidir_entry '
 drivers/pinctrl/pinctrl-rza1.c:98: warning: cannot understand function prototype: 'struct rza1_swio_pin '
 drivers/pinctrl/pinctrl-rza1.c:108: warning: cannot understand function prototype: 'struct rza1_swio_entry '
 drivers/pinctrl/pinctrl-rza1.c:116: warning: cannot understand function prototype: 'struct rza1_pinmux_conf '
 drivers/pinctrl/pinctrl-rza1.c:443: warning: cannot understand function prototype: 'struct rza1_mux_conf '
 drivers/pinctrl/pinctrl-rza1.c:462: warning: cannot understand function prototype: 'struct rza1_port '
 drivers/pinctrl/pinctrl-rza1.c:482: warning: cannot understand function prototype: 'struct rza1_pinctrl '
 drivers/pinctrl/pinctrl-rza1.c:546: warning: Function parameter or member 'port' not described in 'rza1_pinmux_get_flags'
 drivers/pinctrl/pinctrl-rza1.c:546: warning: Function parameter or member 'pin' not described in 'rza1_pinmux_get_flags'
 drivers/pinctrl/pinctrl-rza1.c:546: warning: Function parameter or member 'func' not described in 'rza1_pinmux_get_flags'
 drivers/pinctrl/pinctrl-rza1.c:546: warning: Function parameter or member 'rza1_pctl' not described in 'rza1_pinmux_get_flags'
 drivers/pinctrl/pinctrl-rza1.c:575: warning: Function parameter or member 'port' not described in 'rza1_set_bit'
 drivers/pinctrl/pinctrl-rza1.c:575: warning: Function parameter or member 'reg' not described in 'rza1_set_bit'
 drivers/pinctrl/pinctrl-rza1.c:575: warning: Function parameter or member 'bit' not described in 'rza1_set_bit'
 drivers/pinctrl/pinctrl-rza1.c:575: warning: Function parameter or member 'set' not described in 'rza1_set_bit'
 drivers/pinctrl/pinctrl-rza1.c:672: warning: Function parameter or member 'rza1_pctl' not described in 'rza1_pin_mux_single'
 drivers/pinctrl/pinctrl-rza1.c:672: warning: Excess function parameter 'pinctrl' description in 'rza1_pin_mux_single'

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Jacopo Mondi <jacopo@jmondi.org>
Link: https://lore.kernel.org/r/20200713144930.1034632-21-lee.jones@linaro.org
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>