[PATCH] ptp: ocp: don't allow on S390

Fix kconfig warning on arch/s390/:

WARNING: unmet direct dependencies detected for SERIAL_8250
  Depends on [n]: TTY [=y] && HAS_IOMEM [=y] && !S390 [=y]
  Selected by [m]:
  - PTP_1588_CLOCK_OCP [=m] && PTP_1588_CLOCK [=m] && HAS_IOMEM [=y] && PCI [=y] && SPI [=y] && I2C [=m] && MTD [=m]

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Jonathan Lemon <redacted>
---
There is no 8250 serial on S390. See commit 1598e38c0770.
Is this driver useful even without 8250 serial?

 drivers/ptp/Kconfig |    1 +
 1 file changed, 1 insertion(+)

--- linux-next-20210813.orig/drivers/ptp/Kconfig
+++ linux-next-20210813/drivers/ptp/Kconfig

@@ -158,6 +158,7 @@ config PTP_1588_CLOCK_OCP
 	depends on PTP_1588_CLOCK
 	depends on HAS_IOMEM && PCI
 	depends on SPI && I2C && MTD
+	depends on !S390
 	imply SPI_MEM
 	imply SPI_XILINX
 	imply MTD_SPI_NOR