mpc83xx: Miscellaneous code style fixes

Implement various code style fixes and similar changes.

Signed-off-by: Timur Tabi <timur@freescale.com>
diff --git a/board/mpc8349itx/mpc8349itx.c b/board/mpc8349itx/mpc8349itx.c
index 097bb37..4838e70 100644
--- a/board/mpc8349itx/mpc8349itx.c
+++ b/board/mpc8349itx/mpc8349itx.c
@@ -349,7 +349,7 @@
 	u8 i2c_data;
 
 #ifdef CFG_I2C_RTC_ADDR
-	char ds1339_data[17];
+	u8 ds1339_data[17];
 #endif
 
 #ifdef CFG_I2C_EEPROM_ADDR