imx-codec: add missing configure options

Enable VPU and hard float support when the configuration contains:
BR2_ARM_EABIHF=y
BR2_PACKAGE_IMX_VPU=y

See Yocto equivalent:
https://github.com/Freescale/meta-fsl-arm/blob/krogoth/recipes-multimedia/imx-codec/imx-codec.inc



Signed-off-by: Gary Bisson <gary.bisson@boundarydevices.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>