ARM: davinci: use is IS_ENABLED macro

This patches replaces #if defined() by IS_ENABLED macro, which provides
better readability.

Signed-off-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
Cc: Sekhar Nori <nsekhar@ti.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>

arch/arm/mach-davinci/board-dm646x-evm.c

@@ -117,12 +117,7 @@ static struct platform_device davinci_nand_device = {
 	},
 };
 
-#if defined(CONFIG_BLK_DEV_PALMCHIP_BK3710) || \
-    defined(CONFIG_BLK_DEV_PALMCHIP_BK3710_MODULE)
-#define HAS_ATA 1
-#else
-#define HAS_ATA 0
-#endif
+#define HAS_ATA		IS_ENABLED(CONFIG_BLK_DEV_PALMCHIP_BK3710)
 
 /* CPLD Register 0 bits to control ATA */
 #define DM646X_EVM_ATA_RST		BIT(0)