quark_x10xx: cleanup of LOG format specifiers

quark_x10xx: cleanup of LOG format specifiers

Fix for LOG format specifiers, this is a superset of those
exposed by the arm-none-eabi build.

Add 0x prefix for all values printed in hex.

Add LOG messages for error cases when enabling or disabling
paging.

Change-Id: I070c556e0ad31204231a2b572e7b93af22a9bc61
Signed-off-by: Ivan De Cesaris <ivan.de.cesaris@intel.com>
Reviewed-on: http://openocd.zylin.com/2149
Tested-by: jenkins
Reviewed-by: Paul Fertser <fercerpav@gmail.com>