logd: Remove $(KERNEL_HEADERS) include.

Points to wrong kernel-headers dir in multi-arch
builds.

(cherry picked from commit 920a5629ff91ee0f5decaaf4f16a8fb3af752496)

Change-Id: I5055bf5cd80119a34f0a6b0872ffb0a422a06baf
diff --git a/logd/Android.mk b/logd/Android.mk
index f536dad..a99c748 100644
--- a/logd/Android.mk
+++ b/logd/Android.mk
@@ -15,8 +15,6 @@
     LogBufferElement.cpp \
     LogTimes.cpp
 
-LOCAL_C_INCLUDES := $(KERNEL_HEADERS)
-
 LOCAL_SHARED_LIBRARIES := \
     libsysutils \
     liblog \