ata: Migrate CONFIG_SATA_SIL to Kconfig

Use 'imply' here liberally to avoid the combinatorial explosion of
defconfig changes in the PowerPC boards.

Signed-off-by: Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>
diff --git a/arch/powerpc/cpu/mpc85xx/Kconfig b/arch/powerpc/cpu/mpc85xx/Kconfig
index 92187d3..1b0e3d3 100644
--- a/arch/powerpc/cpu/mpc85xx/Kconfig
+++ b/arch/powerpc/cpu/mpc85xx/Kconfig
@@ -209,6 +209,7 @@
 	select ARCH_P1025
 	imply CMD_EEPROM
 	imply CMD_SATA
+	imply SATA_SIL
 
 config TARGET_P2020RDB
 	bool "Support P2020RDB-PC"
@@ -217,6 +218,7 @@
 	select ARCH_P2020
 	imply CMD_EEPROM
 	imply CMD_SATA
+	imply SATA_SIL
 
 config TARGET_P1_TWR
 	bool "Support p1_twr"
@@ -672,6 +674,7 @@
 	imply CMD_SATA
 	imply CMD_PCI
 	imply CMD_REGINFO
+	imply SATA_SIL
 
 config ARCH_P1021
 	bool
@@ -690,6 +693,7 @@
 	imply CMD_NAND
 	imply CMD_SATA
 	imply CMD_REGINFO
+	imply SATA_SIL
 
 config ARCH_P1022
 	bool
@@ -737,6 +741,7 @@
 	imply CMD_SATA
 	imply CMD_PCI
 	imply CMD_REGINFO
+	imply SATA_SIL
 
 config ARCH_P1025
 	bool
@@ -858,6 +863,7 @@
 	select FSL_ELBC
 	imply CMD_SATA
 	imply CMD_REGINFO
+	imply SATA_SIL
 
 config ARCH_P5020
 	bool