CONFIG_ARCH_QSD8X50 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

QSD8X50

modulename: sirc.ko

and/or

board-qsd8x50.ko

configname: CONFIG_ARCH_QSD8X50

Qualcomm MSM SoC Type
└─>QSD8X50
In linux kernel since version 2.6.35 (release Date: 2010-08-01)  
source code:
/arch/arm/mach-msm/sirc.c
selects
CONFIG_ARCH_MSM_SCORPION
CONFIG_MSM_SMD
CONFIG_MSM_VIC
CONFIG_CPU_V7
CONFIG_MSM_REMOTE_SPINLOCK_LDREX