Add trusty support for imx8mm, default load address and size of trusty are 0xbe000000 anx 0x2000000. Signed-off-by: Ji Luo <ji.luo@nxp.com> Signed-off-by: Jacky Bai <ping.bai@nxp.com> Change-Id: I3f8b1adc08933e38a39f1ab1723947319d19a703