Modify your buildfile to support 720p screen resolution

The default buildfiles requires some modifications to support a screen resolution of 720p. Make the following changes to the src/hardware/support/appsmedia-sample/appsmedia-sample-board.build file:

In the start-graphics section, change:

#Start devi-hid with a width and height parameter.
#The width and height must match graphics.conf
devi-hid -R800,480 touch kbd &

to:

#Start devi-hid with a width and height parameter.
#The width and height must match graphics.conf
devi-hid -R1280,720 touch kbd &

In the graphics.conf display internal configuration section, change:
```
video-mode = 800 x 480 @ 60
```
to:
```
video-mode = 1280 x 720 @ 60
```

In the graphics.conf mtouch configuration section, change:

options = height=480,width=800,poll=1000

to:

options = height=720,width=1280,poll=1000

In the scaling.conf section, change:
```
800x480:mode=direct
```
to:
```
1280x720:mode=direct
```

For i.MX6 boards, you must make additional changes:

In the graphics.conf dislay 1 configuration section (line 117), change:

# HDMI display
wfd-dlls = libwfdcfg-imx6x-hdmi.so libimx6xCSCgamma-generic.so libWFDimx6x.so

to:

# 720p display
wfd-dlls = libwfdcfg-imx6x-qnx-car.so libimx6xCSCgamma-generic.so libWFDimx6x.so

In the Graphics files section (line 338), add:

/usr/lib/graphics/iMX6X/libwfdcfg-imx6x-qnx-car.so=libwfdcfg-imx6x-qnx-car.so

To regenerate the final Apps and Media image, type the following command:
```
make appsmedia-sample
```