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Add support for Microchip OTP controller available on SAMA7G5. The OTPC
controls the access to a non-volatile memory. The memory behind OTPC is
organized into packets, packets are composed by a fixed length header
(4 bytes long) and a variable length payload (payload length is available
in the header). When software request the data at an offset in memory
the OTPC will return (via header + data registers) the whole packet that
has a word at that offset. For the OTP memory layout like below:

offset  OTP Memory layout

         .           .
         .    ...    .
         .           .
0x0E     +-----------+	<--- packet X
         | header  X |
0x12     +-----------+
         | payload X |
0x16     |           |
         |           |
0x1A     |           |
         +-----------+
         .           .
         .    ...    .
         .           .

if user requests data at address 0x16 the data started at 0x0E will be
returned by controller. User will be able to fetch th...