sm8150-common: Enable UXE

Matches stock Qualcomm configuration and improves performance.
OnePlus disables this because of their framework features, which
we do not have.

Change-Id: I75a1efb3f1963041ed4a810bffad539d81dac992
Signed-off-by: Park Ju Hyung <qkrwngud825@gmail.com>