oem: meta: Add decode_oem_meta_file_io_read_req()

Add decode_oem_meta_file_io_read_req function.

This function is used to decode the message of reading file IO.
Need to include read_option (read fi

oem: meta: Add decode_oem_meta_file_io_read_req()

Add decode_oem_meta_file_io_read_req function.

This function is used to decode the message of reading file IO.
Need to include read_option (read file attributes or data), length
(the length of the read data) and read_info (The information
needed to read the file).
Take reading file data as an example:
read_info needs to contain transferFlag, offset to know the
starting position and transfer progress of the read file.

Change-Id: I425476d36e3cd69d2da45beceff1c4a2362640dc
Signed-off-by: Lora Lin <lora.lin.wiwynn@gmail.com>

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