feat(st): adapt stm32 linker scripts for clang

With Clang, the address inside a section does not seem relative to its
start address. Use ABSOLUTE keyword for those addresses.
For stm32 binary containing BL2 and its DT, we can use that as PIE is
not used (either disabled or used with BL2_IN_XIP_MEM).
This is still working with GCC.

Signed-off-by: Yann Gautier <yann.gautier@st.com>
Change-Id: I4e06c8a72c41370695db27fb6c52414487dfae47
2 files changed