Unmark input.evdev.default from vendor lib

This HAL is using android/input.h which is not available to vendors.
Unmark this HAL back to platform lib so that the header is accessible.

Note that this does not block our effort of splitting system/vendor
builds since this HAL is not used in any Treble-enabled device.

Bug: 37342627
Test: BOARD_VNDK_VERSION=current m -j input.evdev.default
Change-Id: I4f900cb58802bccf8d06f995a4e52c3b450f4799
diff --git a/modules/input/evdev/Android.mk b/modules/input/evdev/Android.mk
index be4db6b..9a5d092 100644
--- a/modules/input/evdev/Android.mk
+++ b/modules/input/evdev/Android.mk
@@ -45,7 +45,6 @@
 
 LOCAL_MODULE := input.evdev.default
 LOCAL_MODULE_RELATIVE_PATH := hw
-LOCAL_PROPRIETARY_MODULE := true
 
 LOCAL_SRC_FILES := \
     EvdevModule.cpp