CONFIG_BF52x is not available for thedefaultarchitecture x86.
Result is shown for architecture blackfin

CONFIG_BF52x (not configurable)

configname: CONFIG_BF52x

Linux Kernel Configuration
└─>BF52x
In linux kernel since version 2.6.24 (release Date: 2008-01-24)  

is selected by
CONFIG_USB_MUSB_HDRC