avr32: data_bits should reflect the actual number of data bits

Make the data_bits enum in struct sdram_config reflect the actual number
of data bits on the bus, i.e. 16 or 32. Having 0 mean 16 bits and 1 mean
32 bits is just too confusing.

Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>

include/asm-avr32/sdram.h

@@ -25,8 +25,8 @@
 struct sdram_config {
 	/* Number of data bits. */
 	enum {
-		SDRAM_DATA_16BIT,
-		SDRAM_DATA_32BIT,
+		SDRAM_DATA_16BIT = 16,
+		SDRAM_DATA_32BIT = 32,
 	} data_bits;
 
 	/* Number of address bits */