perf tools: Add includes for detected configs in Makefile.perf

Makefile.perf uses "CONFIG_*" checks in the code. Example the config for
libtraceevent is used to set PYTHON_EXT_SRCS

	ifeq ($(CONFIG_LIBTRACEEVENT),y)
	  PYTHON_EXT_SRCS := $(shell grep -v ^\# util/python-ext-sources)
	else
	  PYTHON_EXT_SRCS := $(shell grep -v '^\#\|util/trace-event.c' util/python-ext-sources)
	endif

But this is not picking the value for CONFIG_LIBTRACEEVENT that is set
using the settings in Makefile.config. Include the file
".config-detected" so that make will use the system detected
configuration in the CONFIG checks.

This will fix isues that could arise when other "CONFIG_*" checks are
added to Makefile.perf in future as well.

Reviewed-by: Ian Rogers <[email protected]>
Signed-off-by: Athira Rajeev <[email protected]>
Cc: Disha Goel <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Kajol Jain <[email protected]>
Cc: Madhavan Srinivasan <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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