mfd: intel_soc_pmic_bxtwc: Chain power button IRQs as well

[ Upstream commit 9f8ddee1dab836ca758ca8fc555ab5a3aaa5d3fd ]

Power button IRQ actually has a second level of interrupts to
distinguish between UI and POWER buttons. Moreover, current
implementation looks awkward in approach to handle second level IRQs by
first level related IRQ chip.

To address above issues, split power button IRQ to be chained as well.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>