subsys: disk: move conditional location
subsys: disk: move conditional location

We had the if in the wrong place causing some Kconfigs to be set even if
DISK_ACCESS was not configured in.

Signed-off-by: Anas Nashif <0d9952ec84ac43c159f6b7e7ed99a9080c00dd6e@intel.com>

Vudentz/zephyr,explora26/zephyr,zephyrproject-rtos/zephyr,punitvara/zephyr,punitvara/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,nashif/zephyr,Vudentz/zephyr,GiulianoFranchetto/zephyr,GiulianoFranchetto/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,Vudentz/zephyr,GiulianoFranchetto/zephyr,zephyrproject-rtos/zephyr,GiulianoFranchetto/zephyr,nashif/zephyr,explora26/zephyr,explora26/zephyr,ldts/zephyr,GiulianoFranchetto/zephyr,punitvara/zephyr,Vudentz/zephyr,punitvara/zephyr,ldts/zephyr,finikorg/zephyr,ldts/zephyr,nashif/zephyr,punitvara/zephyr,finikorg/zephyr,nashif/zephyr,explora26/zephyr,ldts/zephyr,finikorg/zephyr,finikorg/zephyr,finikorg/zephyr,explora26/zephyr,galak/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,Vudentz/zephyr,Vudentz/zephyr,ldts/zephyr