hw: bsp: frdm-k82f: Fix QSPI flash definition
hw: bsp: frdm-k82f: Fix QSPI flash definition

Use correct syscfg to access QSPI flash.

Signed-off-by: Fabio Utzig <66676b1ceaf93296e098708c09494361103aa635@apache.org>

mlaz/mynewt-core,mlaz/mynewt-core,mlaz/mynewt-core,mlaz/mynewt-core,mlaz/mynewt-core