ARM: dts: NSP: Fixed QSPI compatible string

The string was incorrectly defined before from least to most
specific, swap the compatible strings accordingly.

Fixes: 329f98c1 ("ARM: dts: NSP: Add QSPI nodes to NSPI and bcm958625k DTSes")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>