Revert "Set WifiHAL to only log debug by default."

Recent changes have brought the log volumes for
the QCA WifiHAL down to reasonable levels. As
such, we no longer need to use a custom default
log level for WifiHAL.

This reverts commit f83213a5b5cd69dc816daa27cff6d03c4d75b5a4.

BUG=28178513
TEST=build, check log volume after >12 hours
diff --git a/target/product/base.mk b/target/product/base.mk
index 89166fa..d0d65e2 100644
--- a/target/product/base.mk
+++ b/target/product/base.mk
@@ -128,12 +128,6 @@
     vold \
     wm
 
-# TODO: Remove after N. Set WifiHAL to only log debug by default.
-# This is not the proper way to really fix this, but it is the best thing to
-# do in the time period we have for N.  In the future they will be moving
-# more to a dumpsys style approach.
-PRODUCT_PROPERTY_OVERRIDES += \
-    persist.log.tag.WifiHAL=I
 
 PRODUCT_COPY_FILES := $(call add-to-product-copy-files-if-exists,\
     frameworks/base/preloaded-classes:system/etc/preloaded-classes)