Included support for directly mapped SJA1000 into PCI mem region 0.

Included support for directly mapped SJA1000 into PCI mem region 0.

SJA1000 mapped into memory BAR0 is used by experimental
SJA1000 CAN controller emulator for QEMU implemented
by Jin Yang in the frame of GSoC 2013 slot for RTEMS
CAN related work. The RTEMS maintainers identified
lack of broad available test environment as main
problem and decided to denote one RTEMS GSoC 2013
to be for QEMU enhancement.

More information about QEMU setup with CAN for Linux
host system and Linux and RTEMS quest systems can
be found on RTEMS Wiki

  http://wiki.rtems.org/wiki/index.php/Qemu_simulations

Experimental version of QEMU 1.4.2 with SJA1000 hardware
emulation is available from Jin Yang's GitHub project

  https://github.com/Jin-Yang/QEMU-1.4.2

Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>