tests: kernel: smp_boot_delay: Convert CONFIG_MP_NUM_CPUS handling

Move build and build system checks to use CONFIG_MP_MAX_NUM_CPUS
as we phase out CONFIG_MP_NUM_CPUS.

Signed-off-by: Kumar Gala <[email protected]>

Author: galak

tests/kernel/smp_boot_delay/src/main.c

@@ -16,7 +16,7 @@
 BUILD_ASSERT(CONFIG_SMP);
 BUILD_ASSERT(CONFIG_SMP_BOOT_DELAY);
 BUILD_ASSERT(CONFIG_KERNEL_COHERENCE);
-BUILD_ASSERT(CONFIG_MP_NUM_CPUS > 1);
+BUILD_ASSERT(CONFIG_MP_MAX_NUM_CPUS > 1);
 
 #define STACKSZ 2048
 char stack[STACKSZ];