We supply two of these.  The first is controlled by the System Configuration
registers and the second one provided is a more traditional 'memory mapped'
variant.  Each are handled by they own sub-driver.
Signed-off-by: Ajit Pal Singh <ajitpal.singh@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Maxime Coquelin <maxime.coquelin@st.com>