securelaunch: helpers: make getBlkInfo() and storageBlkDevices global
securelaunch: helpers: make getBlkInfo() and storageBlkDevices global

policy sub package needs to iterate over all block devices
to locate policy file. we already have variables and functions in
helpers file that help us acheive that. Making these variables/functions
global in helpers file would allow policy sub package to re-use these.

Signed-off-by: Simran Singh <83c3bfa9a00ecf3331cec3f1babab6589b76d543@oracle.com>

u-root/u-root,u-root/u-root,hugelgupf/u-root,hugelgupf/u-root,u-root/u-root,hugelgupf/u-root,hugelgupf/u-root