help with March 25 tablet build of Android 7.1 Nougat on Raspberry Pi 3 and 7 inch touch screen

[avd...@kemsense.com]

Hi, I got the following tablet build working on Raspberry pi 3 and the official 7 inch touch screen. 

https://mega.nz/#!4MFyAaxK!vSiwuUxrAao6P6C6071_gmzzpvA3L-RsWrXd_XvJHXg

The resolution is all perfect but the touch screen doesn't seem to work. 

Any inputs would be greatly appreciated 

My config.txt looks like the follows:

hdmi_force_hotplug=1

hdmi_drive=2

hdmi_group=2

hdmi_mode=85

disable_overscan=1

config_hdmi_boost=5

kernel=zImage

dtparam=audio=on

dtparam=i2c1=on

dtparam=i2c_arm=on

dtoverlay=vc4-fkms-v3d,cma-256

#dtoverlay=vc4-fkms-v3d,cma-256

initramfs ramdisk.img 0x01f00000

mask_gpu_interrupt0=0x400

avoid_warnings=2

enable_uart=1

framebuffer_width=800

framebuffer_height=480