ns16550: move CONFIG_SYS_NS16550 to Kconfig

Move CONFIG_SYS_NS16550 to Kconfig, and run moveconfig.py.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
diff --git a/configs/am335x_gp_evm_defconfig b/configs/am335x_gp_evm_defconfig
index f5cd48c..b6c2198 100644
--- a/configs/am335x_gp_evm_defconfig
+++ b/configs/am335x_gp_evm_defconfig
@@ -13,4 +13,5 @@
 CONFIG_DM_MMC=y
 CONFIG_SPI_FLASH=y
 CONFIG_DM_ETH=y
+CONFIG_SYS_NS16550=y
 CONFIG_RSA=y