power: supply: ab8500: remove unused struct 'inst_curr_result_list'

'inst_curr_result_list' is unused since the original
commit 13151631 ("ab8500-fg: A8500 fuel gauge driver").

Remove it.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20240528000634.196707-3-linux@treblig.org


Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>