esp32: enable smp for esp32-devkitc:psram_usrheap config

boards/xtensa/esp32/esp32-devkitc/configs/psram_usrheap/defconfig

@@ -15,6 +15,7 @@ CONFIG_ARCH_BOARD_ESP32_DEVKITC=y
 CONFIG_ARCH_CHIP="esp32"
 CONFIG_ARCH_CHIP_ESP32=y
 CONFIG_ARCH_CHIP_ESP32WROVER=y
+CONFIG_ARCH_INTERRUPTSTACK=2048
 CONFIG_ARCH_STACKDUMP=y
 CONFIG_ARCH_XTENSA=y
 CONFIG_BOARD_LOOPSPERMSEC=16717
@@ -38,7 +39,7 @@ CONFIG_IOB_NBUFFERS=36
 CONFIG_IOB_NCHAINS=36
 CONFIG_IOB_THROTTLE=8
 CONFIG_MM_IOB=y
-CONFIG_MM_REGIONS=3
+CONFIG_MM_REGIONS=4
 CONFIG_NSH_ARCHINIT=y
 CONFIG_NSH_BUILTIN_APPS=y
 CONFIG_NSH_FILEIOSIZE=512
@@ -50,6 +51,8 @@ CONFIG_RAM_START=0x20000000
 CONFIG_RR_INTERVAL=200
 CONFIG_SCHED_HPWORK=y
 CONFIG_SCHED_WAITPID=y
+CONFIG_SMP=y
+CONFIG_SMP_NCPUS=2
 CONFIG_START_DAY=6
 CONFIG_START_MONTH=12
 CONFIG_START_YEAR=2011
@@ -58,4 +61,5 @@ CONFIG_SYSTEM_NSH=y
 CONFIG_TESTING_GETPRIME=y
 CONFIG_TESTING_MM=y
 CONFIG_TESTING_OSTEST=y
+CONFIG_TESTING_SMP=y
 CONFIG_UART0_SERIAL_CONSOLE=y