ARM: dts: keystone: fix io range for usb_phy0

The IO range size is set incorrectly for USB PHY0 deivice
it should be 24 instead of 32. Otherwise, It causes
USB PHY1 probing failure.

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>