feat(imx8mn): enable Trusty OS for imx8mn

Add trusty support for imx8mn, default load address and
size of trusty are 0xbe000000 and 0x2000000.

Signed-off-by: Ji Luo <ji.luo@nxp.com>
Signed-off-by: Jacky Bai <ping.bai@nxp.com>
Change-Id: I63fd5159027d7400b8c6bfc03193dd1330c43140
1 file changed