ARM: dts: vfxxx: Include support for qspi1 functionality.

This commit extends the existing Vybrid QSPI devicetree implementation
to also describe the qspi1 functional block.

Signed-off-by: Cory Tusar <cory.tusar@pid1solutions.com>
Reviewed-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>