package/freescale-imx/imx-gpu-viv: use make loops instead of shell loops

package/freescale-imx/imx-gpu-viv: use make loops instead of shell loops

We generally prefer using make loops instead of shell loops. They
bring automatic error handling, as they abort the loop when there is
an error, without the need for "|| exit 1".

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Reviewed-by: Gary Bisson <gary.bisson@boundarydevices.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>