MAINTAINERS: update IMX kernel git tree
MAINTAINERS: update IMX kernel git tree

Change Shawn's email address to his employer, and move IMX git tree to
kernel.org.

Cc: Sascha Hauer <c65a0fb7e74ffd2c9fc3a0f9aacb0f6a24b0a68b@pengutronix.de>
Signed-off-by: Shawn Guo <912cf7eb7d8018e2943586ae6657d21fd4e38239@linaro.org>
Signed-off-by: Olof Johansson <8c69ee23f3f44f8162a64d579c1fa25c2f55298a@lixom.net>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs