CONFIG_BOARD_HAMMERHEAD_SND is not available for thedefaultarchitecture x86.
Result is shown for architecture avr32
default or selected kernelversion does not have config value CONFIG_BOARD_HAMMERHEAD_SND.
Result is shown for kernelversion 6.5.1

Atmel AC97 Sound support

configname: CONFIG_BOARD_HAMMERHEAD_SND

Linux Kernel Configuration
└─>Atmel AC97 Sound support
In linux kernel since version 2.6.29 (release Date: 2009-03-23)  
This enables Sound support for the Hammerhead board. You may
also go through the ALSA settings to get it working.

Choose 'Y' here if you have ordered a Corona daugther board and
want to make your board funky.