While calculating the length of the property value to be replaced with,
also include the "\0" character. This makes the length of the new property
value "host" to be 5 and not 4.
Fixes: d0d92256cb ("arm: mach-k3: am642_init: Fix the length of new property value in fdt_find_and_setprop()")
Signed-off-by: Aswath Govindraju <a-govindraju@ti.com>