defconfig: lahaina: Fix INTERCONNECT_TEST being disabled for QGKI

CONFIG_INTERCONNECT_TEST should be enabled in all config variants. The
interconnect-test debugfs files are required for debugging and
performance testing. It's set to CONFIG_INTERCONNECT_TEST=m in
lahaina_GKI.config, which should normally enable it for all variants.
But it's being unset in the lahaina_QGKI.config fragment.

Removing the "is not set" line is sufficient to re-enable it for the
standard build. But for some reason "make menuconfig" doesn't enable it,
which means its fairly easy for people to accidentally merge the
auto-generated "is not set" line again. It's not clear why menuconfig
doesn't enable it, but for now explicitly enable INTERCONNECT_TEST in
lahaina_QGKI.config as well.

Change-Id: I044f0dd6ce32dbf6522df5402a33805b808f3c1b
Signed-off-by: Mike Tipton <mdtipton@codeaurora.org>