imx-base: make gstreamer1.0 packages socarch specific
gstreamer and its plugins have been forked for i.MX. So all of the generated
packages should have their PACKAGE_ARCH set to SOCARCH.
Prevents, when building gstreamer for an i.MX machine followed by a non i.MX
machine:
| ERROR: gstreamer1.0-1.14.4-r0 do_packagedata_setscene: QA Issue: Package version for package gstreamer1.0 went backwards which would break package feeds from (0:1.14.imx-r0 to 0:1.14.4-r0) [version-going-backwards]
| and many more for each generated package
Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>
