lttng-ust: Fix missing header files in SDK
lttng-ust: Fix missing header files in SDK

Ensure that lttng-ust-dev is included when lttng-ust provided libraries
are included in sdk (RDEPENDS).

Signed-off-by: Esben Haabendal <da90c138e4a9573086862393cde34fa33d74f6e5@haabendal.dk>

oe-lite/base,oe-lite/base,oe-lite/base,oe-lite/base,oe-lite/base,oe-lite/base