qemu_armv8a: use VIRT_SECURE_MEM as secure memory
qemu_armv8a: use VIRT_SECURE_MEM as secure memory

Redefine secure memory as defined by VIRT_SECURE_MEM in QEMU

Secure SRAM is used by ARM-TF as 0x0e000000..0x0f000000
Define TZDRAM_BASE to 0x0e100000 (size 0x00f00000)

Reviewed-by: Pascal Brand <0b55292d2562685bad4ce52d64f802e8f1cd299e@linaro.org>
Tested-by: Jens Wiklander <7706914404370d7502c27a0eff493dcf491feb51@linaro.org> (QEMU armv8a)
Signed-off-by: Jens Wiklander <7706914404370d7502c27a0eff493dcf491feb51@linaro.org>

cedric-chaumont-st-dev/optee_os,matt2048/optee_os,matt2048/optee_os,pascal-brand-st-dev/optee_os,cedric-chaumont-st-dev/optee_os,pascal-brand-st-dev/optee_os,matt2048/optee_os,cedric-chaumont-st-dev/optee_os,cedric-chaumont-st-dev/optee_os,pascal-brand-st-dev/optee_os,matt2048/optee_os,pascal-brand-st-dev/optee_os,pascal-brand-st-dev/optee_os