spi: nuvoton: add NPCM PSPI controller driver

Add Nuvoton NPCM BMC Peripheral SPI controller driver.
NPCM750 include two general-purpose SPI interface.

Signed-off-by: Jim Liu <JJLIU0@nuvoton.com>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index 50ba435..bf1ffd2 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -52,6 +52,7 @@
 obj-$(CONFIG_MXC_SPI) += mxc_spi.o
 obj-$(CONFIG_MXS_SPI) += mxs_spi.o
 obj-$(CONFIG_NPCM_FIU_SPI) += npcm_fiu_spi.o
+obj-$(CONFIG_NPCM_PSPI) += npcm_pspi.o
 obj-$(CONFIG_NXP_FSPI) += nxp_fspi.o
 obj-$(CONFIG_ATCSPI200_SPI) += atcspi200_spi.o
 obj-$(CONFIG_OCTEON_SPI) += octeon_spi.o