spi: Add function callback to get configuration of SPI bus

Add a new callback to spi_ctrlr structure - get_config - to obtain
configuration of SPI bus from the controller driver. Also, move common
config definitions from acpi_device.h to spi-generic.h

BUG=chrome-os-partner:59832
BRANCH=None
TEST=Compiles successfully

Change-Id: I412c8c70167d18058a32041c2310bc1c884043ce
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://review.coreboot.org/18337
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>

src/arch/x86/include/arch/acpi_device.h

@@ -18,6 +18,7 @@
 
 #include <device/i2c.h>
 #include <stdint.h>
+#include <spi-generic.h>
 
 #define ACPI_DESCRIPTOR_LARGE		(1 << 7)
 #define ACPI_DESCRIPTOR_INTERRUPT	(ACPI_DESCRIPTOR_LARGE | 9)
@@ -216,23 +217,6 @@ void acpi_device_write_i2c(const struct acpi_i2c *i2c);
  * ACPI SPI Bus
  */
 
-enum spi_clock_phase {
-	SPI_CLOCK_PHASE_FIRST,
-	SPI_CLOCK_PHASE_SECOND
-};
-
-/* SPI Flags bit 0 */
-enum spi_wire_mode {
-	SPI_4_WIRE_MODE,
-	SPI_3_WIRE_MODE
-};
-
-/* SPI Flags bit 1 */
-enum spi_polarity {
-	SPI_POLARITY_LOW,
-	SPI_POLARITY_HIGH
-};
-
 struct acpi_spi {
 	/* Device selection */
 	uint16_t device_select;