boards: maix-bit: Add knsh_smp

Summary:
- This commit adds knsh_smp for maix-bit

Impact:
- None

Testing:
- Tested with QEMU

Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>

boards/risc-v/k210/maix-bit/README.txt

@@ -38,4 +38,4 @@
 
   Support peripherals such as GPIO/SPI/I2C/...
   Support FPU
-  Support memory protection for user mode
+  Support RISC-V U-mode including memory protection

boards/risc-v/k210/maix-bit/configs/knsh_smp/defconfig

@@ -0,0 +1,61 @@
+#
+# This file is autogenerated: PLEASE DO NOT EDIT IT.
+#
+# You can use "make menuconfig" to make any modifications to the installed .config file.
+# You can then do "make savedefconfig" to generate a new defconfig file that includes your
+# modifications.
+#
+# CONFIG_STANDARD_SERIAL is not set
+CONFIG_ARCH="risc-v"
+CONFIG_ARCH_BOARD="maix-bit"
+CONFIG_ARCH_BOARD_MAIX_BIT=y
+CONFIG_ARCH_CHIP="k210"
+CONFIG_ARCH_CHIP_K210=y
+CONFIG_ARCH_INTERRUPTSTACK=2048
+CONFIG_ARCH_RISCV=y
+CONFIG_ARCH_STACKDUMP=y
+CONFIG_ARCH_USE_MPU=y
+CONFIG_BOARD_LOOPSPERMSEC=46000
+CONFIG_BUILD_PROTECTED=y
+CONFIG_BUILTIN=y
+CONFIG_DEBUG_FULLOPT=y
+CONFIG_DEBUG_SYMBOLS=y
+CONFIG_DEV_ZERO=y
+CONFIG_EXAMPLES_HELLO=y
+CONFIG_FS_PROCFS=y
+CONFIG_IDLETHREAD_STACKSIZE=2048
+CONFIG_INTELHEX_BINARY=y
+CONFIG_LIBC_PERROR_STDOUT=y
+CONFIG_LIBC_STRERROR=y
+CONFIG_MAX_TASKS=64
+CONFIG_MM_KERNEL_HEAPSIZE=524288
+CONFIG_NSH_ARCHINIT=y
+CONFIG_NSH_BUILTIN_APPS=y
+CONFIG_NSH_READLINE=y
+CONFIG_NSH_STRERROR=y
+CONFIG_NUTTX_USERSPACE=0x80100000
+CONFIG_PASS1_BUILDIR="boards/risc-v/k210/maix-bit/kernel"
+CONFIG_POSIX_SPAWN_PROXY_STACKSIZE=2048
+CONFIG_PREALLOC_TIMERS=4
+CONFIG_RAM_SIZE=2097152
+CONFIG_RAM_START=0x80400000
+CONFIG_RAW_BINARY=y
+CONFIG_READLINE_CMD_HISTORY=y
+CONFIG_RR_INTERVAL=200
+CONFIG_SMP=y
+CONFIG_SMP_NCPUS=2
+CONFIG_STACK_COLORATION=y
+CONFIG_START_DAY=9
+CONFIG_START_MONTH=4
+CONFIG_START_YEAR=2021
+CONFIG_SYSTEM_NSH=y
+CONFIG_SYSTEM_SYSTEM=y
+CONFIG_SYSTEM_TASKSET=y
+CONFIG_SYS_RESERVED=8
+CONFIG_TASK_NAME_SIZE=20
+CONFIG_TESTING_GETPRIME=y
+CONFIG_TESTING_OSTEST=y
+CONFIG_TESTING_SMP=y
+CONFIG_UART0_SERIAL_CONSOLE=y
+CONFIG_USERMAIN_STACKSIZE=3072
+CONFIG_USER_ENTRYPOINT="nsh_main"