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

HPE GXP SoC

modulename: gxp.ko

configname: CONFIG_ARCH_HPE_GXP

Linux Kernel Configuration
└─>HPE SoC support
└─>HPE GXP SoC
In linux kernel since version 4.14.326 (release Date: 2023-09-23)  
HPE GXP is the name of the HPE Soc. This SoC is used to implement many
BMC features at HPE. It supports ARMv7 architecture based on the Cortex
A9 core. It is capable of using an AXI bus to which a memory controller
is attached. It has multiple SPI interfaces to connect boot flash and
BIOS flash. It uses a 10/100/1000 MAC for network connectivity. It
has multiple i2c engines to drive connectivity with a host
infrastructure.

source code:
selects
CONFIG_ARM_VIC
CONFIG_GENERIC_IRQ_CHIP
CONFIG_CLKSRC_MMIO


is selected by
CONFIG_GXP_WATCHDOG