redhat/kernel.spec: require libbabeltrace2-devel

Yaakov Selkowitzrequested to merge
yselkowitz1/kernel-ark:os-build into os-build

This is necessary due to commit 536e81f0 "perf data ctf: replace libbabeltrace with babeltrace2-ctf-writer", and fixes this message during the build:

"Makefile.config:1044: No babeltrace2 found, disables 'perf data' CTF format support, please install libbabeltrace2-dev[el]"

Signed-off-by: Yaakov Selkowitz yselkowi@redhat.com

/cc @jmflinuxtx

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