[POWERPC] fsl_spi: stop using device_type = "spi"

Also:
- rename "fsl_spi" to "fsl,spi";
- add and use cell-index property, if found;
- split probing code out of fsl_spi_init, thus we can call
  it for legacy device_type probing and new "compatible" probing.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/arch/powerpc/boot/dts/mpc8568mds.dts b/arch/powerpc/boot/dts/mpc8568mds.dts
index 692d5bd..c929fba 100644
--- a/arch/powerpc/boot/dts/mpc8568mds.dts
+++ b/arch/powerpc/boot/dts/mpc8568mds.dts
@@ -302,8 +302,8 @@
 		};
 
 		spi@4c0 {
-			device_type = "spi";
-			compatible = "fsl_spi";
+			cell-index = <0>;
+			compatible = "fsl,spi";
 			reg = <4c0 40>;
 			interrupts = <2>;
 			interrupt-parent = <&qeic>;
@@ -311,8 +311,8 @@
 		};
 
 		spi@500 {
-			device_type = "spi";
-			compatible = "fsl_spi";
+			cell-index = <1>;
+			compatible = "fsl,spi";
 			reg = <500 40>;
 			interrupts = <1>;
 			interrupt-parent = <&qeic>;