lttng-modules: Do not fail if CONFIG_TRACEPOINTS is not enabled

lttng-modules: Do not fail if CONFIG_TRACEPOINTS is not enabled

The lttng-modules are being pulled by the tools-profile image feature,
however, not every kernel has the CONFIG_TRACEPOINTS feature enabled.

This change makes the build do not fail when CONFIG_TRACEPOINTS is not
available, allowing it to be kept being pulled by default.

(From OE-Core rev: 6215ffec6a3d5069cc74ae9853167c3c6395b1db)

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>