Move PWR related init from bl2 to bl32.

Change-Id: I61b62ef2208bee0e502dd5fab277d806c205e7b1
Signed-off-by: Pascal Paillet <p.paillet@st.com>
Reviewed-on: https://gerrit.st.com/c/mpu/oe/st/tf-a/+/183647


Reviewed-by: CITOOLS <smet-aci-reviews@lists.codex.cro.st.com>
Reviewed-by: Yann GAUTIER <yann.gautier@st.com>
Tested-by: Yann GAUTIER <yann.gautier@st.com>

Change-Id: I31ecbe922a32be5f370a52037160d8544bc82688
Signed-off-by: Yann Gautier <yann.gautier@st.com>

Auto-stop SMC is called by stm32 cpu-idle kernel driver
in order to enter in Stop mode.

Signed-off-by: Pascal Paillet <p.paillet@st.com>
Change-Id: I9b29a7a3fa7f77a4854bfccc20d068552f9cc58f

Change-Id: I8e0ba794e5ded1290fb83fe8d43ce54d4dc0e320
Signed-off-by: Yann Gautier <yann.gautier@st.com>