boards: px4_fmu-v6x sync with other stm32h7 boards

Author: dagar

boards/px4/fmu-v6x/nuttx-config/nsh/defconfig

@@ -102,6 +102,7 @@ CONFIG_MTD_BYTE_WRITE=y
 CONFIG_MTD_PARTITION=y
 CONFIG_MTD_PROGMEM=y
 CONFIG_MTD_RAMTRON=y
+CONFIG_NAME_MAX=40
 CONFIG_NET=y
 CONFIG_NETDB_DNSCLIENT=y
 CONFIG_NETDB_DNSCLIENT_ENTRIES=8
@@ -157,6 +158,8 @@ CONFIG_RAMTRON_WRITEWAIT=y
 CONFIG_RAM_SIZE=245760
 CONFIG_RAM_START=0x20010000
 CONFIG_RAW_BINARY=y
+CONFIG_READLINE_CMD_HISTORY=y
+CONFIG_READLINE_TABCOMPLETION=y
 CONFIG_RTC_DATETIME=y
 CONFIG_SCHED_ATEXIT=y
 CONFIG_SCHED_HPWORK=y