mfd: intel_soc_pmic_bxtwc: Fix a typo in MODULE_DEVICE_TABLE()

Fix a typo in MODULE_DEVICE_TABLE(). 'pmic_acpi_ids' should be
'bxtwc_acpi_ids'.

Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>