Platform: Fix GCC13 warning

Following warning
    warning: ../bin/tfm_s.axf has a LOAD segment with RWX permissions

was introduced in 99f6386e9

This commit fixes it by marking section as READONLY.

Signed-off-by: Bohdan Hunko <Bohdan.Hunko@infineon.com>
Change-Id: I60dd6b2ae27dc20150d87db4a8437086932a42d9
21 files changed