selftests/bpf: Disable CONFIG_DEBUG_INFO_REDUCED in config.aarch64

selftests/bpf: Disable CONFIG_DEBUG_INFO_REDUCED in config.aarch64

Building an arm64 kernel and seftests/bpf with defconfig +
selftests/bpf/config and selftests/bpf/config.aarch64 the fragment
CONFIG_DEBUG_INFO_REDUCED is enabled in arm64's defconfig, it should be
disabled in file sefltests/bpf/config.aarch64 since if its not disabled
CONFIG_DEBUG_INFO_BTF wont be enabled.

Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20231103220912.333930-1-anders.roxell@linaro.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>