tests/kernel/context: Properly idle on MAX32 family

Make sure MAX32_ON_ENTER_CPU_IDLE_HOOK is disabled for the context test, so
the CPU will actually idle with WFI and not return before the timer
expires for test_cpu_idle test.

Signed-off-by: Pete Johanson <[email protected]>

Author: petejohanson-adi

tests/kernel/context/prj.conf

@@ -1,3 +1,6 @@
 CONFIG_IRQ_OFFLOAD=y
 CONFIG_ZTEST=y
 CONFIG_MP_MAX_NUM_CPUS=1
+
+# On MAX32, this will prevent WFI by default, so disable this config
+CONFIG_MAX32_ON_ENTER_CPU_IDLE_HOOK=n