arm: Fix some inconsistent debug-UART CONFIG options

A few boards enable CONFIG_DEBUG_UART_BOARD_INIT but do not define the
required init function. Fix this by disabling the debug UART.

With snow the debug UART is enabled but the driver CONFIG is not. Fix this
too.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/elgin-rv1108_defconfig b/configs/elgin-rv1108_defconfig
index ee5bfdd..ed6557a 100644
--- a/configs/elgin-rv1108_defconfig
+++ b/configs/elgin-rv1108_defconfig
@@ -6,6 +6,7 @@
 CONFIG_ENV_OFFSET=0x3F8000
 CONFIG_DEFAULT_DEVICE_TREE="rv1108-elgin-r1"
 CONFIG_ROCKCHIP_RV1108=y
+# CONFIG_DEBUG_UART_BOARD_INIT is not set
 CONFIG_ROCKCHIP_BOOT_MODE_REG=0
 CONFIG_TARGET_ELGIN_RV1108=y
 CONFIG_DEBUG_UART_BASE=0x10210000
diff --git a/configs/evb-rk3128_defconfig b/configs/evb-rk3128_defconfig
index e446a22..544d6de 100644
--- a/configs/evb-rk3128_defconfig
+++ b/configs/evb-rk3128_defconfig
@@ -6,6 +6,7 @@
 CONFIG_ENV_OFFSET=0x0
 CONFIG_DEFAULT_DEVICE_TREE="rk3128-evb"
 CONFIG_ROCKCHIP_RK3128=y
+# CONFIG_DEBUG_UART_BOARD_INIT is not set
 CONFIG_DEBUG_UART_BASE=0x20068000
 CONFIG_DEBUG_UART_CLOCK=24000000
 CONFIG_DEBUG_UART=y
diff --git a/configs/evb-rv1108_defconfig b/configs/evb-rv1108_defconfig
index 916a6fb..b6510b5 100644
--- a/configs/evb-rv1108_defconfig
+++ b/configs/evb-rv1108_defconfig
@@ -5,6 +5,7 @@
 CONFIG_NR_DRAM_BANKS=1
 CONFIG_DEFAULT_DEVICE_TREE="rv1108-evb"
 CONFIG_ROCKCHIP_RV1108=y
+# CONFIG_DEBUG_UART_BOARD_INIT is not set
 CONFIG_DEBUG_UART_BASE=0x10210000
 CONFIG_DEBUG_UART_CLOCK=24000000
 CONFIG_DEBUG_UART=y
diff --git a/configs/pm9g45_defconfig b/configs/pm9g45_defconfig
index 9382c38..96260e0 100644
--- a/configs/pm9g45_defconfig
+++ b/configs/pm9g45_defconfig
@@ -8,7 +8,6 @@
 CONFIG_NR_DRAM_BANKS=1
 CONFIG_DM_GPIO=y
 CONFIG_DEFAULT_DEVICE_TREE="at91sam9m10g45ek"
-CONFIG_DEBUG_UART_BOARD_INIT=y
 CONFIG_DEBUG_UART_BASE=0xffffee00
 CONFIG_DEBUG_UART_CLOCK=132000000
 CONFIG_ENV_OFFSET_REDUND=0x100000
diff --git a/configs/snow_defconfig b/configs/snow_defconfig
index e5bac37..0018112 100644
--- a/configs/snow_defconfig
+++ b/configs/snow_defconfig
@@ -18,6 +18,7 @@
 CONFIG_SPL=y
 CONFIG_DEBUG_UART_BASE=0x12c30000
 CONFIG_DEBUG_UART_CLOCK=100000000
+CONFIG_DEBUG_UART_S5P=y
 CONFIG_IDENT_STRING=" for snow"
 CONFIG_DEBUG_UART=y
 CONFIG_DISTRO_DEFAULTS=y