selftests/livepatch: Replace set_dynamic_debug() with setup_config() in README

Commit 35c9e74cff4c ("selftests/livepatch: Make dynamic debug setup and
restore generic") introduced setup_config() to set up the environment
for each test. It superseded set_dynamic_debug(). README still mentions
set_dynamic_debug(), so update it to setup_config() which should be used
now in every test.

Signed-off-by: Miroslav Benes <[e-mail]>
Reviewed-by: Kamalesh Babulal <[e-mail]>
Signed-off-by: Shuah Khan <[e-mail]>

tools/testing/selftests/livepatch/README

···
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 See the common functions.sh file for the existing collection of utility
-functions, most importantly set_dynamic_debug() and check_result().  The
+functions, most importantly setup_config() and check_result().  The
 latter function greps the kernel's ring buffer for "livepatch:" and
 "test_klp" strings, so tests be sure to include one of those strings for
 result comparison.  Other utility functions include general module