serial: pch_uart: revert Kconfig for non-DMA mode

PCH_DMA is not always enabled when a user uses PCH_UART.
Since overhead of DMA is not small, in case of low frequent
communication, without DMA is better.
Thus, "select PCH_DMA" and DMADEVICES are unnecessary
Signed-off-by: NTomoya MORINAGA <tomoya-linux@dsn.okisemi.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/tty/serial/Kconfig

@@ -1588,10 +1588,9 @@ config SERIAL_IFX6X60
 	  Support for the IFX6x60 modem devices on Intel MID platforms.
 
 config SERIAL_PCH_UART
-	tristate "Intel EG20T PCH UART"
-	depends on PCI && DMADEVICES
+	tristate "Intel EG20T PCH UART/OKI SEMICONDUCTOR ML7213 IOH"
+	depends on PCI
 	select SERIAL_CORE
-	select PCH_DMA
 	help
 	  This driver is for PCH(Platform controller Hub) UART of Intel EG20T
 	  which is an IOH(Input/Output Hub) for x86 embedded processor.