spi/pxa2xx: Add ACPI ID for Intel Braswell

The SPI host controller is the same as used in Baytrail, only the ACPI ID
is different so add this new ID to the list.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
Cc: stable@vger.kernel.org