refactor(st-clock): remove BL32 support on STM32MP13

TF-A BL32 (SP_MIN) is not supported on STM32MP13. Only OP-TEE is used
as BL32. Remove the code under IMAGE_BL32 flag in STM32MP13 driver.

Signed-off-by: Yann Gautier <yann.gautier@st.com>
Change-Id: I6cc9f230782c44129b205e66a44cdb4bcb5f95c3
1 file changed