{tty: serial, nand: onenand}: samsung: rename to fix build warning

Any arm config which has 'CONFIG_MTD_ONENAND_SAMSUNG=m' and
'CONFIG_SERIAL_SAMSUNG=m' gives a build warning:

warning: same module names found:
  drivers/tty/serial/samsung.ko
  drivers/mtd/nand/onenand/samsung.ko

Rename both drivers/tty/serial/samsung.c to
drivers/tty/serial/samsung_tty.c and drivers/mtd/nand/onenand/samsung.c
drivers/mtd/nand/onenand/samsung_mtd.c to fix the warning.
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Acked-by: Richard Weinberger <richard@nod.at>
Link: https://lore.kernel.org/r/20191117202435.28127-1-sudipm.mukherjee@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/mtd/nand/onenand/Makefile

@@ -9,6 +9,6 @@ obj-$(CONFIG_MTD_ONENAND)		+= onenand.o
 # Board specific.
 obj-$(CONFIG_MTD_ONENAND_GENERIC)	+= generic.o
 obj-$(CONFIG_MTD_ONENAND_OMAP2)		+= omap2.o
-obj-$(CONFIG_MTD_ONENAND_SAMSUNG)       += samsung.o
+obj-$(CONFIG_MTD_ONENAND_SAMSUNG)       += samsung_mtd.o
 
 onenand-objs = onenand_base.o onenand_bbt.o

drivers/tty/serial/Makefile

@@ -30,7 +30,7 @@ obj-$(CONFIG_SERIAL_PXA_NON8250) += pxa.o
 obj-$(CONFIG_SERIAL_PNX8XXX) += pnx8xxx_uart.o
 obj-$(CONFIG_SERIAL_SA1100) += sa1100.o
 obj-$(CONFIG_SERIAL_BCM63XX) += bcm63xx_uart.o
-obj-$(CONFIG_SERIAL_SAMSUNG) += samsung.o
+obj-$(CONFIG_SERIAL_SAMSUNG) += samsung_tty.o
 obj-$(CONFIG_SERIAL_MAX3100) += max3100.o
 obj-$(CONFIG_SERIAL_MAX310X) += max310x.o
 obj-$(CONFIG_SERIAL_IP22_ZILOG) += ip22zilog.o