sanders: build a 32bit version of sensorservice

system_server is currently responable of starting SensorService and
since it is a 64bit instance, system looks for 64bit sensorhal.
Disable this mechanism and manually start SensorService with a 32bit
copy of sensorservice to force the system using the 32bit HAL

This is based on vache's work on potter

device.mk

@@ -346,7 +346,8 @@ PRODUCT_COPY_FILES += \
     $(LOCAL_PATH)/configs/sensors/sensor_def_qcomdev.conf:system/etc/sensors/sensor_def_qcomdev.conf
 
 PRODUCT_PACKAGES += \
-    android.hardware.sensors@1.0-impl
+    android.hardware.sensors@1.0-impl \
+    sensorservice_32
 
 # Thermal
 PRODUCT_COPY_FILES += \

sensorservice/Android.mk

@@ -0,0 +1,23 @@
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES:= \
+    ../../../../frameworks/native/services/sensorservice/main_sensorservice.cpp
+
+LOCAL_SHARED_LIBRARIES := \
+    libsensorservice \
+    libbinder \
+    libutils
+
+LOCAL_CFLAGS := -Wall -Werror -Wextra
+
+LOCAL_MODULE_TAGS := optional
+
+LOCAL_MODULE:= sensorservice_32
+
+LOCAL_32_BIT_ONLY := true
+LOCAL_INIT_RC := sensorservice.rc
+LOCAL_PROPRIETARY_MODULE := true
+
+include $(BUILD_EXECUTABLE)

sensorservice/sensorservice.rc

@@ -0,0 +1,3 @@
+service sensorservice /vendor/bin/sensorservice_32
+    class main
+    user root