risc-v/mpfs: enable DEFAULT_SMALL for insufficient envm capacity

to fix ci error about apache#14070

Signed-off-by: wanggang26 <[email protected]>

boards/risc-v/mpfs/icicle/configs/rpmsg-sbi/defconfig

@@ -25,6 +25,7 @@ CONFIG_BUILTIN=y
 CONFIG_DEBUG_FEATURES=y
 CONFIG_DEBUG_FULLOPT=y
 CONFIG_DEBUG_SYMBOLS=y
+CONFIG_DEFAULT_SMALL=y
 CONFIG_EXPERIMENTAL=y
 CONFIG_FAT_LCNAMES=y
 CONFIG_FAT_LFN=y
@@ -58,54 +59,8 @@ CONFIG_MPFS_OPENSBI=y
 CONFIG_MPFS_UART0=y
 CONFIG_NSH_ARCHINIT=y
 CONFIG_NSH_BUILTIN_APPS=y
-CONFIG_NSH_DISABLE_BASENAME=y
-CONFIG_NSH_DISABLE_CAT=y
-CONFIG_NSH_DISABLE_CD=y
-CONFIG_NSH_DISABLE_CMP=y
-CONFIG_NSH_DISABLE_CP=y
-CONFIG_NSH_DISABLE_DD=y
-CONFIG_NSH_DISABLE_DF=y
-CONFIG_NSH_DISABLE_DIRNAME=y
-CONFIG_NSH_DISABLE_DMESG=y
-CONFIG_NSH_DISABLE_ECHO=y
-CONFIG_NSH_DISABLE_ENV=y
-CONFIG_NSH_DISABLE_EXEC=y
-CONFIG_NSH_DISABLE_EXIT=y
-CONFIG_NSH_DISABLE_EXPORT=y
-CONFIG_NSH_DISABLE_FREE=y
-CONFIG_NSH_DISABLE_GET=y
-CONFIG_NSH_DISABLE_HEXDUMP=y
-CONFIG_NSH_DISABLE_IFCONFIG=y
-CONFIG_NSH_DISABLE_IFUPDOWN=y
-CONFIG_NSH_DISABLE_KILL=y
-CONFIG_NSH_DISABLE_LOSETUP=y
-CONFIG_NSH_DISABLE_MKDIR=y
-CONFIG_NSH_DISABLE_MKFATFS=y
-CONFIG_NSH_DISABLE_MKRD=y
-CONFIG_NSH_DISABLE_MOUNT=y
-CONFIG_NSH_DISABLE_MV=y
-CONFIG_NSH_DISABLE_PRINTF=y
-CONFIG_NSH_DISABLE_PS=y
-CONFIG_NSH_DISABLE_PUT=y
-CONFIG_NSH_DISABLE_PWD=y
-CONFIG_NSH_DISABLE_RM=y
-CONFIG_NSH_DISABLE_RMDIR=y
-CONFIG_NSH_DISABLE_SET=y
-CONFIG_NSH_DISABLE_SLEEP=y
-CONFIG_NSH_DISABLE_SOURCE=y
-CONFIG_NSH_DISABLE_TEST=y
-CONFIG_NSH_DISABLE_TIME=y
-CONFIG_NSH_DISABLE_TRUNCATE=y
-CONFIG_NSH_DISABLE_UMOUNT=y
-CONFIG_NSH_DISABLE_UNAME=y
-CONFIG_NSH_DISABLE_UNSET=y
-CONFIG_NSH_DISABLE_UPTIME=y
-CONFIG_NSH_DISABLE_USLEEP=y
-CONFIG_NSH_DISABLE_WGET=y
-CONFIG_NSH_DISABLE_XD=y
 CONFIG_NSH_LINELEN=160
 CONFIG_OPENSBI=y
-CONFIG_PREALLOC_TIMERS=4
 CONFIG_RAM_SIZE=1048576
 CONFIG_RAM_START=0x08000000
 CONFIG_RAW_BINARY=y