samsung: board: fix: Define loop iterator as an unsigned int to suppress gcc 4.8 warning

This patch suppress following warning:

board/samsung/common/board.c:95:32: warning: iteration 4u invokes undefined behavior [-Waggressive-loop-optimizations]
   addr = CONFIG_SYS_SDRAM_BASE + (i * SDRAM_BANK_SIZE);
                                ^
board/samsung/common/board.c:94:2: note: containing loop

about possible signed integer overflow at gcc 4.8.2 (odroid board)

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

board/samsung/common/board.c

@@ -88,7 +88,7 @@ int board_init(void)
 
 int dram_init(void)
 {
-	int i;
+	unsigned int i;
 	u32 addr;
 
 	for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
@@ -100,7 +100,7 @@ int dram_init(void)
 
 void dram_init_banksize(void)
 {
-	int i;
+	unsigned int i;
 	u32 addr, size;
 
 	for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {