tests/kernel/context: Remove BOARD_NATIVE_POSIX check

native_posix has been removed. There is no need to check for it
anymore.

Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>
diff --git a/tests/kernel/context/src/main.c b/tests/kernel/context/src/main.c
index 699c7bd..32e176d 100644
--- a/tests/kernel/context/src/main.c
+++ b/tests/kernel/context/src/main.c
@@ -57,7 +57,7 @@
 #elif defined(CONFIG_SPARC)
 #elif defined(CONFIG_MIPS)
 #elif defined(CONFIG_ARCH_POSIX)
-#if defined(CONFIG_BOARD_NATIVE_POSIX) || defined(CONFIG_BOARD_NATIVE_SIM)
+#if defined(CONFIG_BOARD_NATIVE_SIM)
 #define TICK_IRQ TIMER_TICK_IRQ
 #else
 /*