px4/io-v2: update nuttx config

px4_io - add knob to ensure ARCH_MATH_H is kept

   Upstream changes added ARCH_HAVE_MATH_H to protect from archs
   without math.h from causing isses for users setting
   CONFIG_ARCH_MATH_H and getting errors. PX4 provides a math.h
   and we need CONFIG_ARCH_MATH_H set. So this Selects
   ARCH_HAVE_MATH_H perserving CONFIG_ARCH_MATH_H a defconfig

boards/px4/io-v2/nuttx-config/Kconfig

@@ -0,0 +1,9 @@
+#
+# For a description of the syntax of this configuration file,
+# see misc/tools/kconfig-language.txt.
+#
+# Hack to ensure ARCH_MATH_H is kept
+config BOARD_HAVE_MATH_H
+	bool "Provide ARCH math.h (selects ARCH_HAVE_MATH_H)"
+	default y
+	select ARCH_HAVE_MATH_H

boards/px4/io-v2/nuttx-config/drivers/Kconfig

@@ -0,0 +1 @@
+

boards/px4/io-v2/nuttx-config/nsh/defconfig

@@ -7,8 +7,11 @@
 #
 # CONFIG_DEV_NULL is not set
 CONFIG_ARCH="arm"
+CONFIG_ARCH_BOARD_CUSTOM=y
 CONFIG_ARCH_BOARD_CUSTOM_DIR="../nuttx-config"
+CONFIG_ARCH_BOARD_CUSTOM_DIR_RELPATH=y
 CONFIG_ARCH_BOARD_CUSTOM_NAME="px4"
+CONFIG_ARCH_CHIP="stm32"
 CONFIG_ARCH_CHIP_STM32=y
 CONFIG_ARCH_CHIP_STM32F100C8=y
 CONFIG_ARCH_MATH_H=y
@@ -22,9 +25,7 @@ CONFIG_DEBUG_SYMBOLS=y
 CONFIG_DEFAULT_SMALL=y
 CONFIG_DISABLE_MOUNTPOINT=y
 CONFIG_DISABLE_MQUEUE=y
-CONFIG_DISABLE_POLL=y
 CONFIG_DISABLE_PTHREAD=y
-CONFIG_DISABLE_SIGNALS=y
 CONFIG_FDCLONE_DISABLE=y
 CONFIG_FDCLONE_STDIO=y
 CONFIG_HAVE_CXX=y