neutrino: Enable PSI

Previously, I was under the misguided impression that lmkd's PSI
integration was dependant on ro.lmk.use_psi which apparently is not
the case.

Signed-off-by: Adam W. Willis <return.of.octobot@gmail.com>

arch/arm64/configs/vendor/neutrino_defconfig

@@ -104,7 +104,8 @@ CONFIG_TASKSTATS=y
 # CONFIG_TASK_DELAY_ACCT is not set
 CONFIG_TASK_XACCT=y
 CONFIG_TASK_IO_ACCOUNTING=y
-# CONFIG_PSI is not set
+CONFIG_PSI=y
+# CONFIG_PSI_DEFAULT_DISABLED is not set
 
 #
 # RCU Subsystem