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This fixes shift overflow errors, when compiled with CONSOLE_DEBUG
support:

plat/imx/common/include/imx8_iomux.h:11:35: error: result of ‘1 << 31’
requires 33 bits to represent, but ‘int’ only has 32 bits
[-Werror=shift-overflow=]
Signed-off-by: Igor Opaniuk <igor.opaniuk@gmail.com>
Change-Id: I0488e22c30314ba27caabc5c767164baa1e8004c

All identifiers, regardless of use, that start with two underscores are
reserved. This means they can't be used in header guards.

The style that this project is now to use the full name of the file in
capital letters followed by 'H'. For example, for a file called
"uart_example.h", the header guard is UART_EXAMPLE_H.

The exceptions are files that are imported from other projects:

- CryptoCell driver
- dt-bindings folders
- zlib headers

Change-Id: I50561bf6c88b491ec440d0c8385c74650f3c106e
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>

NXP's i.MX8 SoCs have system controller (M4 core)
which takes control of clock management, power management,
partition management, PAD management etc., other
clusters like Cortex-A35 can send out command via MU
(Message Unit) to system controller for clock/power
management etc..

This patch adds basic IPC(inter-processor communication) support.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>