package/freescale-imx/imx-gpu-g2d: fix the file name for ARM

NXP apparently changed file naming convention for this particular file.

Fixes: 1d0ea8d4 (package/freescale-imx/imx-gpu-g2d: bump to version 6.4.0.p1.0)
Signed-off-by: Timo Ketola <timo.ketola@exertus.fi>
Reviewed-by: Gary Bisson <gary.bisson@boundarydevices.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>