recipes-bsp: barebox_2018.11.0-phy1.bb: AM335x: Update create_nand_partitions
recipes-bsp: barebox_2018.11.0-phy1.bb: AM335x: Update create_nand_partitions

Upate script to create NAND partition for a system using rauc
- Add rauc to output message
- Don't delete nand flash completly
- Add -y to ubiformat
- Add ubidetach at the end

Signed-off-by: Teresa Remmet <f049cc77bcba8c1f96fb2cde28e4d780e9ebedaa@phytec.de>
Signed-off-by: Stefan Müller-Klieser <a3e08e35e4a42be768e7d0e76ae1ba321c2a66dd@phytec.de>

PHYTEC-Messtechnik-GmbH/meta-phytec,PHYTEC-Messtechnik-GmbH/meta-phytec,PHYTEC-Messtechnik-GmbH/meta-phytec,PHYTEC-Messtechnik-GmbH/meta-phytec,PHYTEC-Messtechnik-GmbH/meta-phytec