arm: imx: add iMX7S WaARP7 board definition
arm: imx: add iMX7S WaARP7 board definition

This patch adds a simple option to select a WaARP7 board build. Existing
code upstream does most of the work here.

Make this board port with:

make PLATFORM=imx PLATFORM_FLAVOR=mx7swarp7 ARCH=arm CFG_PAGEABLE_ADDR=0
CFG_DT_ADDR=0x83000000 DEBUG=y CFG_TEE_CORE_LOG_LEVEL=1 -j 8

Signed-off-by: Bryan O'Donoghue <165dc05575478af93ac2f97f67be6e1756010094@linaro.org>
Reviewed-by: Peng Fan <d3c162a96b7fb54e5d94bc77bc2c7cbbce10806f@nxp.com>

pascal-brand-st-dev/optee_os,pascal-brand-st-dev/optee_os,pascal-brand-st-dev/optee_os,pascal-brand-st-dev/optee_os,pascal-brand-st-dev/optee_os