ARM: dts: BCM5301X: Fixed QSPI compatible string

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

Fixes: 1c8f4065 ("ARM: dts: BCM5301X: convert to iProc QSPI")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>