serial: npcm: Add support for Nuvoton NPCM SoCs

Add Nuvoton BMC NPCM7xx/NPCM8xx uart driver

Signed-off-by: Jim Liu <JJLIU0@nuvoton.com>
Signed-off-by: Stanley Chu <yschu@nuvoton.com>
diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
index d8e26d7..51de06a 100644
--- a/drivers/serial/Makefile
+++ b/drivers/serial/Makefile
@@ -66,6 +66,7 @@
 obj-$(CONFIG_MVEBU_A3700_UART) += serial_mvebu_a3700.o
 obj-$(CONFIG_MPC8XX_CONS) += serial_mpc8xx.o
 obj-$(CONFIG_NULLDEV_SERIAL) += serial_nulldev.o
+obj-$(CONFIG_NPCM_SERIAL) += serial_npcm.o
 obj-$(CONFIG_OCTEON_SERIAL_BOOTCMD) += serial_octeon_bootcmd.o
 obj-$(CONFIG_OCTEON_SERIAL_PCIE_CONSOLE) += serial_octeon_pcie_console.o
 obj-$(CONFIG_OWL_SERIAL) += serial_owl.o