[libata] Promise driver split part 1: clone to sx4

Clone sata_promise to sata_sx4.

drivers/scsi/Kconfig

@@ -434,10 +434,18 @@ config SCSI_ATA_PIIX
 	  If unsure, say N.
 
 config SCSI_SATA_PROMISE
-	tristate "Promise SATA support"
+	tristate "Promise SATA TX2/TX4 support"
 	depends on SCSI_SATA && PCI && EXPERIMENTAL
 	help
-	  This option enables support for Promise Serial ATA.
+	  This option enables support for Promise Serial ATA TX2/TX4.
+
+	  If unsure, say N.
+
+config SCSI_SATA_SX4
+	tristate "Promise SATA SX4 support"
+	depends on SCSI_SATA && PCI && EXPERIMENTAL
+	help
+	  This option enables support for Promise Serial ATA SX4.
 
 	  If unsure, say N.
 

drivers/scsi/Makefile

@@ -124,6 +124,7 @@ obj-$(CONFIG_SCSI_SATA_SIL)	+= libata.o sata_sil.o
 obj-$(CONFIG_SCSI_SATA_VIA)	+= libata.o sata_via.o
 obj-$(CONFIG_SCSI_SATA_VITESSE)	+= libata.o sata_vsc.o
 obj-$(CONFIG_SCSI_SATA_SIS)	+= libata.o sata_sis.o
+obj-$(CONFIG_SCSI_SATA_SX4)	+= libata.o sata_sx4.o
 
 obj-$(CONFIG_ARM)		+= arm/