In datasheet, 4.1:
Intel® Curie™ module has 1.8 V and 3.3 V regulators meant for use by platform
applications in addition to a 1.8 V regulator to power internal circuits. These internal
LDO and converters are optional to use and application can provide their own converter
or power source to meet their requirements.
• ESR1 provides platform 3.3 V, which can be used by external platform devices.
• ESR2 provides platform 1.8 V, which can be used by external platform devices.
• ESR3 provides host 1.8 V, which is fed back into Intel® Curie™ module to power
About connect BUCK_OUT to AON_IO_VCC there is some information in datasheet 2.3.2:
Buck converter output of 1.8 V / 3.3 V. It can be connected and used for Awake ON (AON) IO
Connect a 0.1uF decoupling capacitor.
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About your last reply, did it answer your questions? Or do you still have doubts about it?
If you need help creating your custom board, I recommend you to check the schematic of the Arduino 101 board, to see how those pins are connected on the board. This is the link: https://www.arduino.cc/en/uploads/Main/Arduino101-REV4Schematic.pdf
I hope you find this information helpful.