power: supply: cpcap-battery: Fix kerneldoc of cpcap_battery_read_accumulated()

Fix W=1 compile warnings (invalid kerneldoc):

    drivers/power/supply/cpcap-battery.c:292: warning: Function parameter or member 'ccd' not described in 'cpcap_battery_read_accumulated'
    drivers/power/supply/cpcap-battery.c:292: warning: Excess function parameter 'regs' description in 'cpcap_battery_read_accumulated'

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>