linux-kernel config: disable DEBUG_INFO_REDUCED
linux-kernel config: disable DEBUG_INFO_REDUCED

Linux's aarch64 defconfig has been updated in 5.13 to enable "reduced"
debug infos (upstream commit ed938a4bfc58 ("arm64: defconfig: Use
DEBUG_INFO_REDUCED"), but that commits locks DEBUG_INFO_BTF as noticed
in #175467

This disables it back which should fix bpftrace usage of BTF not working
on newer kernels.

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