qt5: add required dependencies

add dependency of lttng-ust in qtbase and that of qtbase in
qtdeclarative to resolve potential compilation failures due to missing
header files provided by the respective packages.

JIRA: http://jira.alm.mentorg.com:8080/browse/SB-1497

Signed-off-by: Fahad Usman <fahad_usman@mentor.com>