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Add the device tree files to support the 2 discovery boards: DK1 & DK2.

Change-Id: I90b4797dc69bd0aab1b643a72c932ead48a03c1f
Signed-off-by: Yann Gautier <yann.gautier@st.com>

Regulator configuration at boot takes more information from DT.
I2C configuration from DT is done in I2C driver.
I2C driver manages more transfer modes.
The min voltage of buck1 should also be increased to 1.2V,
else the platform does not boot.

Heavily modifies stm32_i2c.c since many functions move inside the source
file to remove redundant declarations.

Change-Id: I0bee5d776cf3ff15e687427cd6abc06ab237d025
Signed-off-by: Yann Gautier <yann.gautier@st.com>
Signed-off-by: Etienne Carriere <etienne.carriere@st.com>
Signed-off-by: Lionel Debieve <lionel.debieve@st.com>
Signed-off-by: Nicolas LE BAYON <nicolas.le.bayon@st.com>

The drivers are also updated to reflect the changes.
Set RCC as non-secure.

Change-Id: I568fa1f418355830ad1d4d1cdcdb910fb362231b
Signed-off-by: Yann Gautier <yann.gautier@st.com>

This is the correct name of the IP.
Rename stm32mp1_pmic files to stm32mp_pmic.

Change-Id: I238a7d1f9a1d099daf7788dc9ebbd3146ba2f15f
Signed-off-by: Yann Gautier <yann.gautier@st.com>

Those device tree files are taken from STM32MP1 U-Boot and Linux.
And they are updated to fit TF-A needs.
Signed-off-by: Yann Gautier <yann.gautier@st.com>
Signed-off-by: Lionel Debieve <lionel.debieve@st.com>