pixel3_mainline: device.mk: make fstab device-specific

fstab.common was updated to add virt a/b and slotselect; pixel3 is not
quite ready for it, so temporarily make it device specific and remove
slotselect for now.

TODO: revert this while adding virt a/b support.

Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
Change-Id: Iaaada81e2d2fbdaca2ee630eb61422adaedbbb1d
diff --git a/pixel3_mainline/fstab.pixel3_mainline b/pixel3_mainline/fstab.pixel3_mainline
new file mode 100644
index 0000000..5d82515
--- /dev/null
+++ b/pixel3_mainline/fstab.pixel3_mainline
@@ -0,0 +1,8 @@
+system		/system		ext4	noatime,ro,errors=panic		wait,logical,first_stage_mount
+/dev/block/platform/soc@0/1d84000.ufshc/by-name/userdata /data		ext4	discard,noatime,noauto_da_alloc,data=ordered,user_xattr,barrier=1,inlinecrypt	wait,formattable,fileencryption=aes-256-xts:aes-256-cts:v2+inlinecrypt_optimized,quota
+/dev/block/platform/soc@0/1d84000.ufshc/by-name/metadata	/metadata	ext4	noatime,nosuid,nodev,discard					wait,formattable
+#/dev/block/platform/soc@0/1d84000.ufshc/by-name/misc /misc emmc defaults defaults
+/devices/platform/soc@0/8804000.sdhci/mmc_host/mmc*	auto	auto	defaults	voldmanaged=sdcard1:auto
+vendor		/vendor		ext4	noatime,ro,errors=panic		wait,logical,first_stage_mount
+system_ext	/system_ext	ext4	noatime,ro,errors=panic		wait,logical,first_stage_mount
+product	/product	ext4	noatime,ro,errors=panic		wait,logical,first_stage_mount