CONFIG_ARC_BOARD_ANGEL4 is not available for thedefaultarchitecture x86.
Result is shown for architecture arc
ARC Angel4
configname: CONFIG_ARC_BOARD_ANGEL4
Linux Kernel Configuration
└─>"Legacy" ARC FPGA dev Boards
└─>ARC Angel4
In linux kernel since version 3.1 (release Date: 2011-10-24)
ARC Angel4 FPGA Ref Platform (Xilinx Virtex Based)