mpc52xx: Get rid of board-specific #ifdef's in cpu/mpc5xxx/ide.c

Total5200 and digsy MTC use I2C port 2 pins as a ATA chip select.
To avoid adding board-specific ifdefs to cpu/mpc5xxx/ide.c new
define CONFIG_SYS_ATA_CS_ON_I2C2 was introduced. It is used by
Total5200 and will be used by digsy MTC and other boards with
ATA CS on I2C pins.

Signed-off-by: Grzegorz Bernacki <gjb@semihalf.com>

cpu/mpc5xxx/ide.c

@@ -42,7 +42,7 @@ int ide_preinit (void)
 	struct mpc5xxx_sdma *psdma = (struct mpc5xxx_sdma *) MPC5XXX_SDMA;
 
 	reg = *(vu_long *) MPC5XXX_GPS_PORT_CONFIG;
-#if defined(CONFIG_TOTAL5200)
+#if defined(CONFIG_SYS_ATA_CS_ON_I2C2)
 	/* ATA cs0/1 on i2c2 clk/io */
 	reg = (reg & ~0x03000000ul) | 0x02000000ul;
 #else

include/configs/Total5200.h

@@ -397,6 +397,7 @@
 #define	CONFIG_IDE_RESET		/* reset for ide supported	*/
 #define CONFIG_IDE_PREINIT
 
+#define CONFIG_SYS_ATA_CS_ON_I2C2
 #define CONFIG_SYS_IDE_MAXBUS		1	/* max. 1 IDE bus		*/
 #define CONFIG_SYS_IDE_MAXDEVICE	1	/* max. 1 drive per IDE bus	*/