tests: drivers: buildall: modem: exclude litex_vexriscv

Excluding litex_vexriscv as UART_LITEUART doesn't support interrupts.

Signed-off-by: Yong Cong Sin <[email protected]>

Author: ycsin

tests/drivers/build_all/modem/testcase.yaml

@@ -4,10 +4,10 @@ common:
 tests:
   drivers.modem.build:
     extra_args: CONF_FILE=modem.conf
-    platform_exclude: serpente particle_boron rak5010_nrf52840
+    platform_exclude: serpente particle_boron rak5010_nrf52840 litex_vexriscv
   drivers.modem.ublox_sara.build:
     extra_args: CONF_FILE=modem_ublox_sara.conf
-    platform_exclude: serpente pinnacle_100_dvk
+    platform_exclude: serpente pinnacle_100_dvk litex_vexriscv
   drivers.modem.quectel_bg9x.build:
     extra_args: CONF_FILE=modem_quectel_bg9x.conf
-    platform_exclude: serpente pinnacle_100_dvk
+    platform_exclude: serpente pinnacle_100_dvk litex_vexriscv