drivers/uart/oxpcie_early.c: remove uart_fill_lb()

uart_fill_lb() was added to drivers/uart/uart8250mem.c, so when the
Oxford OXPCIe952 Kconfig option is enabled, we were getting an error.
"multiple definition of `uart_fill_lb'"

The new version of uart_fill_lb sets the regwidth depending on the
Kconfig symbol DRIVERS_UART_8250MEM_32, so if that's selected, don't
give DRIVERS_UART_OXPCIE as a choice.

Change-Id: Ife24ab390553b10b2266809595c2e06463de708c
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/17966
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
diff --git a/src/drivers/uart/Kconfig b/src/drivers/uart/Kconfig
index 518e7ca..54f591d 100644
--- a/src/drivers/uart/Kconfig
+++ b/src/drivers/uart/Kconfig
@@ -47,7 +47,7 @@
 config DRIVERS_UART_OXPCIE
 	bool "Oxford OXPCIe952"
 	default n
-	depends on PCI
+	depends on PCI && !DRIVERS_UART_8250MEM_32
 	select DRIVERS_UART_8250MEM
 	select EARLY_PCI_BRIDGE
 	select UART_OVERRIDE_REFCLK