sched: Define CONFIG_SMP_NCPUS to 1 in no SMP case

to simplify the SMP related code logic

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>

arch/ceva/src/common/up_doirq.c

@@ -39,11 +39,7 @@
  * CURRENT_REGS for portability.
  */
 
-#ifdef CONFIG_SMP
 uint32_t *volatile g_current_regs[CONFIG_SMP_NCPUS];
-#else
-uint32_t *volatile g_current_regs[1];
-#endif
 
 /****************************************************************************
  * Public Functions

arch/ceva/src/common/up_internal.h

@@ -28,6 +28,7 @@
 #include <nuttx/config.h>
 
 #ifndef __ASSEMBLY__
+#  include <nuttx/arch.h>
 #  include <sys/types.h>
 #  include <stdint.h>
 #endif
@@ -110,22 +111,12 @@ extern "C"
  * CURRENT_REGS for portability.
  */
 
-#ifdef CONFIG_SMP
 /* For the case of architectures with multiple CPUs, then there must be one
  * such value for each processor that can receive an interrupt.
  */
 
-int up_cpu_index(void); /* See include/nuttx/arch.h */
-
 EXTERN uint32_t *volatile g_current_regs[CONFIG_SMP_NCPUS];
-#  define CURRENT_REGS (g_current_regs[up_cpu_index()])
-
-#else
-
-EXTERN uint32_t *volatile g_current_regs[1];
-#  define CURRENT_REGS (g_current_regs[0])
-
-#endif
+#define CURRENT_REGS (g_current_regs[up_cpu_index()])
 
 /* This is the beginning of heap as provided from up_head.S.
  * This is the first address in DRAM after the loaded