dts: yaml: Add missing id property to nxp bindings

Fixes build warnings:

extract_dts_includes.py: 'id' property missing in 'Kinetis GPIO'
	binding. Using '<unknown id>'.
extract_dts_includes.py: 'id' property missing in 'Kinetis I2C
	Controller' binding. Using '<unknown id>'.
extract_dts_includes.py: 'id' property missing in 'Kinetis Pinmux'
	binding. Using '<unknown id>'.

Signed-off-by: Maureen Helm <maureen.helm@nxp.com>