power: ab8500: remove unused header

The ab8500.h header in linux/power is not referenced/included, so can be
safely removed.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

include/linux/power/ab8500.h

-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * Copyright (C) ST-Ericsson 2013
- * Author: Hongbo Zhang <hongbo.zhang@linaro.com>
- */
-
-#ifndef PWR_AB8500_H
-#define PWR_AB8500_H
-
-extern const struct abx500_res_to_temp ab8500_temp_tbl_a_thermistor[];
-extern const int ab8500_temp_tbl_a_size;
-
-extern const struct abx500_res_to_temp ab8500_temp_tbl_b_thermistor[];
-extern const int ab8500_temp_tbl_b_size;
-
-#endif /* PWR_AB8500_H */