ppc4xx: Fix GPIO handling in lwmon5 and lcd4_lwmon5 BSP

LCD4 needs a slightly different GPIO configuration than the
original LWMON5 variant. GPIO49 needs to be configured to a
default output value of 0 (permanent voltage supply).

Additionally lcd4 also needs to enable the LSB transmitter.

Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/board/lwmon5/lwmon5.c b/board/lwmon5/lwmon5.c
index 4e4a594..e9aa0b7 100644
--- a/board/lwmon5/lwmon5.c
+++ b/board/lwmon5/lwmon5.c
@@ -527,6 +527,9 @@
 	 */
 	board_early_init_f();
 
+	/* enable the LSB transmitter */
+	gpio_write_bit(CONFIG_SYS_GPIO_LSB_ENABLE, 1);
+
 	/*
 	 * Clear resets
 	 */