arm:board:trats2:FIX: Clear INFORM4 and INFORM5 registers at correct boot

During switch to device tree, commit 1ecab0f3 has removed this code.

INFORM4 and INFORM5 registers are used by TRATS2 first stage bootloader for
providing recovery. For normal operation, those two must be cleared out.

This error emerges when one force reset from u-boot's command line for
three times.
Signed-off-by: NLukasz Majewski <l.majewski@samsung.com>
Cc: Minkyu Kang <mk7.kang@samsung.com>
Acked-by: NMinkyu Kang <mk7.kang@samsung.com>

board/samsung/trats2/trats2.c

@@ -150,9 +150,22 @@ static int pmic_init_max77686(void);
 
 int exynos_init(void)
 {
+	struct exynos4_power *pwr =
+		(struct exynos4_power *)samsung_get_base_power();
+
 	check_hw_revision();
 	printf("HW Revision:\t0x%04x\n", board_rev);
 
+	/*
+	 * First bootloader on the TRATS2 platform uses
+	 * INFORM4 and INFORM5 registers for recovery
+	 *
+	 * To indicate correct boot chain - those two
+	 * registers must be cleared out
+	 */
+	writel(0, &pwr->inform4);
+	writel(0, &pwr->inform5);
+
 	return 0;
 }