rockchip: Turn on CONFIG_DEBUG_UART_NS16550 in defconfigs

No UART driver was specified in defconfig, thus
DEBUG_UART_ALTERA_JTAGUART was incorrectly selected by default since
commit 220e8021 added a new Altera UART
driver.
Signed-off-by: NAriel D'Alessandro <ariel@vanguardiasur.com.ar>
Acked-by: NSimon Glass <sjg@chromium.org>

configs/chromebook_jerry_defconfig

@@ -33,6 +33,7 @@ CONFIG_REGULATOR_ACT8846=y
 CONFIG_RAM=y
 CONFIG_SPL_RAM=y
 CONFIG_DEBUG_UART=y
+CONFIG_DEBUG_UART_NS16550=y
 CONFIG_DEBUG_UART_BASE=0xff690000
 CONFIG_DEBUG_UART_CLOCK=24000000
 CONFIG_DEBUG_UART_SHIFT=2

configs/firefly-rk3288_defconfig

@@ -34,6 +34,7 @@ CONFIG_REGULATOR_ACT8846=y
 CONFIG_RAM=y
 CONFIG_SPL_RAM=y
 CONFIG_DEBUG_UART=y
+CONFIG_DEBUG_UART_NS16550=y
 CONFIG_DEBUG_UART_BASE=0xff690000
 CONFIG_DEBUG_UART_CLOCK=24000000
 CONFIG_DEBUG_UART_SHIFT=2