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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>

This commit defines two things.

- The basic SNVS memory map. At the moment that is total overkill for the
  permission bits we need to set inside the SNVS but, for the sake of
  completeness define the whole SNVS area as a struct.

- The bits of the HPCOMR register

  A permission fix will need to be applied to the SNVS block prior to
  switching on TrustZone. All we need to do is waggle a bit in the HPCOMR
  register. To do that waggle we first need to define the bits of the
  HPCOMR register.

- A imx_snvs_init() function definition

  Declare the snvs_init() function so that it can be called from our
  platform setup code.
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>