CONFIG_MACH_USB_A9263 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_MACH_USB_A9263.
Result is shown for kernelversion 6.2.5

CALAO USB-A9263

modulename: board-usb-a926x.ko

and/or

board-usb-a9263.ko

configname: CONFIG_MACH_USB_A9263

Linux Kernel Configuration
└─>Atmel AT91 System-on-Chip
└─>CALAO USB-A9263
In linux kernel since version 2.6.27 (release Date: 2008-10-09)  
Select this if you are using a Calao Systems USB-A9263.
<http://www.calao-systems.com>

source code:
arch/arm/mach-at91/board-usb-a9263.c