plat-ti: Remove duplicate SECRAM memory definition
plat-ti: Remove duplicate SECRAM memory definition

After removing DEVICEx_TYPE/_PA_BASE/_SIZE support the definition
for SECRAM was moved to main.c, but we had already made this move,
remove the duplicate definition.

Signed-off-by: Andrew F. Davis <a6dfde0ec5c5124d26ab0cb4f9ab9a758dee1d6f@ti.com>
Acked-by: Jerome Forissier <ced78d268b4c9a0a20a59a9feeebd2ad90da03d3@linaro.org>
Acked-by: Jens Wiklander <7706914404370d7502c27a0eff493dcf491feb51@linaro.org>

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