ENGR00139229-2 MX6: Bring up i.MX6 sabreauto with Quad cores
MSL code for bring up MX6 sabreauto board with Quad core.
Enable cpu core local timer, add reset and enable cpu core control,
and enable it in default config.
Merged from testbuild:imx6_bringup branch.
Signed-off-by: Anson Huang <b20788@freescale.com> Signed-off-by: Jason Liu <r64343@freescale.com> Signed-off-by: Zeng Zhaoming <b32542@freescale.com> Merged-by: Zeng Zhaoming <b32542@freescale.com>