refactor(st): rename PLAT_NB_FIXED_REGS

Rename PLAT_NB_FIXED_REGS to PLAT_NB_FIXED_REGUS.
This avoids confusion with regulators and registers.

Signed-off-by: Pascal Paillet <p.paillet@st.com>
Change-Id: Idb2de7204fe978ffcdd729e6cbe453e85fd089b5
2 files changed