refactor(stm32mp2): remove useless STM32MP_SEC_SYSRAM_SIZE

The macro STM32MP_SEC_SYSRAM_SIZE only redefine STM32MP_SYSRAM_SIZE.
Directly use the latter one and remove the STM32MP_SEC_SYSRAM_SIZE.

Signed-off-by: Yann Gautier <yann.gautier@st.com>
Change-Id: I9cca19fda7294be3f31ec74293ce122037541d12
2 files changed