ARM: dts: am43x-epos-evm: Correct Touch controller info

Fixup Y resolution and add default pin state. Also update
the compatible id.

CC: Benoit Cousson <bcousson@baylibre.com>
CC: Tony Lindgren <tony@atomide.com>
CC: Mugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>