feat(st-regulator): add enable ramp-delay

Permit to override enable ramp-delay value from
the device tree in BL2.

Change-Id: Id8e803b368055a50fbd14d4527917c449b958ad9
Signed-off-by: Pascal Paillet <p.paillet@st.com>
Signed-off-by: Maxime Méré <maxime.mere@foss.st.com>
1 file changed