hwmon: (aspeed-g6-pwm-tach): remove redundant driver remove callback

hwmon: (aspeed-g6-pwm-tach): remove redundant driver remove callback

Drops the remove callback as it only asserts reset and the probe already
registers a devres action (devm_add_action_or_reset()) to call
aspeed_pwm_tach_reset_assert().

Fixes: 7e1449cd15d1 ("hwmon: (aspeed-g6-pwm-tacho): Support for ASPEED g6 PWM/Fan tach")
Signed-off-by: Billy Tsai <billy_tsai@aspeedtech.com>
Link: https://lore.kernel.org/r/20260309-pwm_fixes-v2-1-ca9768e70470@aspeedtech.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>