feat(stm32mp15): remove OP-TEE shared mem

The flag STM32MP15_OPTEE_RSV_SHM was disabled and mark deprecated.
Remove the corresponding code.

Signed-off-by: Yann Gautier <yann.gautier@st.com>
Change-Id: I948af3e1de4b89815c967a63abe64f285c405ecc
diff --git a/plat/st/stm32mp1/bl2_plat_setup.c b/plat/st/stm32mp1/bl2_plat_setup.c
index bd3903d..24ecb32 100644
--- a/plat/st/stm32mp1/bl2_plat_setup.c
+++ b/plat/st/stm32mp1/bl2_plat_setup.c
@@ -440,8 +440,7 @@
 				paged_mem_params = get_bl_mem_params_node(BL32_EXTRA2_IMAGE_ID);
 				if (paged_mem_params != NULL) {
 					paged_mem_params->image_info.image_base = STM32MP_DDR_BASE +
-						(dt_get_ddr_size() - STM32MP_DDR_S_SIZE -
-						 STM32MP_DDR_SHMEM_SIZE);
+						(dt_get_ddr_size() - STM32MP_DDR_S_SIZE);
 					paged_mem_params->image_info.image_max_size =
 						STM32MP_DDR_S_SIZE;
 				}