imx6: add flexcan support

backport upstream changes to 3.10:
 - 0060-flexcan.patch:
   - add flexcan pinctrl and devicetree config
 - 0061-can-flexcan-use-correct-clock-as-base-for-bit-rate-c.patch
   - fix a clock issue
 - 0062-ARM-i.MX6q-fix-the-wrong-parent-of-can_root-clock.patch
   - fix a clock issue

Signed-off-by: Tim Harvey <tharvey@gateworks.com>

SVN-Revision: 39033