meta-mender-e31x: conf: Reduce data partition size for E310
meta-mender-e31x: conf: Reduce data partition size for E310

Reducing the data partition would result in a bigger rootfs partition
to support more packages e.g. GNURadio.

Signed-off-by: Sugandha Gupta <d84b5530ef1fc2430e5b91666d65ccc4e6d6f16e@ettus.com>
Signed-off-by: Moritz Fischer <16c4312f096cb05ec900643fe7a5f22f7761ab4a@ettus.com>

EttusResearch/meta-ettus,EttusResearch/meta-ettus,EttusResearch/meta-ettus,EttusResearch/meta-ettus,EttusResearch/meta-ettus,EttusResearch/meta-ettus