boards: Fix to accommodate for slowly tests on UP2

To accommodate for some slow tests on up2.
For example: tests/arch/x86/info/arch.x86.info.userspace
Execution time of this test is close to 55s and sometimes
above up to the 60s.
Related issue: zephyrproject-rtos#80134

Signed-off-by: Artur Wilczak <arturx.wilczak@intel.com>

boards/up-bridge-the-gap/up_squared/up_squared.yaml

@@ -9,6 +9,7 @@ supported:
   - acpi
   - smp
 testing:
+  timeout_multiplier: 2
   ignore_tags:
     - net
     - bluetooth