serial: litex: remove irrational dependency

Depending on `!SERIAL_SUPPORT_INTERRUPT` to enable the driver does not
make any sense, as this is a symbol selected by drivers to signify that
they support interrupts. Simply not selecting this symbol is enough to
convey the desired intention.

This fixes Kconfig problems when the driver is compiled together with
a dummy serial driver which does select `SERIAL_SUPPORT_INTERRUPT`.

Signed-off-by: Jordan Yates <[email protected]>

Author: Jordan Yates

drivers/serial/Kconfig.litex

@@ -6,8 +6,6 @@
 config UART_LITEUART
 	bool "LiteUART serial driver"
 	depends on SOC_RISCV32_LITEX_VEXRISCV
-	# currently not supporting interrupts due to a bug in LiteUART Tx IRQ
-	depends on !SERIAL_SUPPORT_INTERRUPT
 	select SERIAL_HAS_DRIVER
 	help
 	  This option enables LiteUART serial driver.