Fix compiler warnings for PPC systems. Update CHANGELOG.

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/drivers/tsi108_i2c.c b/drivers/tsi108_i2c.c
index 3a3b75c..d6736b0 100644
--- a/drivers/tsi108_i2c.c
+++ b/drivers/tsi108_i2c.c
@@ -276,7 +276,7 @@
 	 * The Tsi108 HW doesn't support sending just the chip address
 	 * and checkong for an <ACK> back.
 	 */
-	return i2c_read (chip, 0, 1, (char *)&tmp, 1);
+	return i2c_read (chip, 0, 1, (uchar *)&tmp, 1);
 }
 
 #endif