Remove android.hardware.wifi from generic_system.mk

This is not a valid build target.

Test: m, observe "includes non-existent modules in PRODUCT_PACKAGES"
      error is no longer present.
Change-Id: Iab621349cab1087382fe2ff1e435a554787b12c0
diff --git a/target/product/generic_system.mk b/target/product/generic_system.mk
index 4c3702a..7aff62c 100644
--- a/target/product/generic_system.mk
+++ b/target/product/generic_system.mk
@@ -73,7 +73,6 @@
     android.hardware.radio.config@1.0 \
     android.hardware.radio.deprecated@1.0 \
     android.hardware.secure_element@1.0 \
-    android.hardware.wifi \
     libaudio-resampler \
     libaudiohal \
     libdrm \