arm: zynq: Add smp support

Zynq is dual core Cortex A9 which starts always
at zero. Using simple trampoline ensure long jump
to secondary_startup code.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>

diff --cc arch/arm/mach-zynq/Kconfig
Simple merge

diff --cc arch/arm/mach-zynq/Makefile
Simple merge

diff --cc arch/arm/mach-zynq/common.c
Simple merge

diff --cc arch/arm/mach-zynq/common.h
Simple merge

diff --cc arch/arm/mach-zynq/headsmp.S
Simple merge

diff --cc arch/arm/mach-zynq/platsmp.c
Simple merge

diff --cc arch/arm/mach-zynq/slcr.c
Simple merge