pixel3_mainline: move the normal fstab path to /vendor/etc/fstab.pixel3_mainline

In aosp/master, GetFstabPath funtion defined here:
     https://android.googlesource.com/platform/system/core/+/refs/heads/master/fs_mgr/fs_mgr_fstab.cpp#411

and the fstab.ramdisk.common does not need to be copied to vendor partition.

Test: boot up pixel3 with mainline kernel: it mounts all partitions correctly, and boots to 'UI',
	also: VtsKernelEncryptionTest#FileBasedEncryptionTest passed 3/3

Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
Change-Id: I5a0e3058d0b580aff06bfea1a01eeb666ce14182
diff --git a/pixel3_mainline/device.mk b/pixel3_mainline/device.mk
index a6d53f0..1365df7 100644
--- a/pixel3_mainline/device.mk
+++ b/pixel3_mainline/device.mk
@@ -20,8 +20,7 @@
 
 PRODUCT_COPY_FILES := \
     device/linaro/dragonboard/fstab.ramdisk.common:$(TARGET_COPY_OUT_RAMDISK)/fstab.pixel3_mainline \
-    device/linaro/dragonboard/fstab.ramdisk.common:$(TARGET_COPY_OUT_VENDOR)/etc/fstab.pixel3_mainline \
-    device/linaro/dragonboard/fstab.common:$(TARGET_COPY_OUT_VENDOR)/etc/init/fstab.pixel3_mainline \
+    device/linaro/dragonboard/fstab.common:$(TARGET_COPY_OUT_VENDOR)/etc/fstab.pixel3_mainline \
     device/linaro/dragonboard/init.common.rc:$(TARGET_COPY_OUT_VENDOR)/etc/init/init.pixel3_mainline.rc \
     device/linaro/dragonboard/init.common.usb.rc:$(TARGET_COPY_OUT_VENDOR)/etc/init/init.pixel3_mainline.usb.rc \
     device/linaro/dragonboard/common.kl:$(TARGET_COPY_OUT_VENDOR)/usr/keylayout/pixel3_mainline.kl