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Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

Squashed commit of the following:

commit 95f3614357446c4a35ec541bb2c21503c54d3fac
Author: Bernhard Nortmann <bernhard.nortmann@web.de>
Date:   Fri Apr 8 09:10:17 2016 +0200

    fel: Add support for multiple sequential readl/writel

    There are cases where "long" reads/writes might be used to transfer
    multiple values from/to sequential addresses.

    When doing so, we can avoid having to setup and upload the entire
    scratch buffer (ARM code) every time, by making the underlying
    functions auto-increment the address on each invocation.

    The patch implements this functionality, and maps the existing
    aw_fel_readl() and aw_fel_writel() to special cases (count == 1).
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

commit 20ececdfc7f3c4070469a7b74ba77bb74e01f876
Author: Bernhard Nortmann <bernhard.nortmann@web.de>
Date:   Fri Apr 8 09:00:20 2016 +0200

    fel: Modify handling of command line args for "readl"/"writel"

    Most other commands use their decoded argument values directly,
    without storing them to local vars first. Also "writel" needs
    an (argc > 3).
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

commit b4216371b97e9f1dd19f7fc2ce720b9cb8e2434e
Author: Siarhei Siamashka <siarhei.siamashka@gmail.com>
Date:   Sat Dec 19 08:22:26 2015 +0200

    fel: Add "readl" and "writel" commands

    The read/write operations done by FEL are not suitable for accessing
    hardware registers. For example, trying to read a SID value using
    the "read" or "hexdump" commands results in the following:

      $ sunxi-fel hexdump 0x01c23800 4
      01c23800: 87 00 00 00 __ __ __ __ __ __ __ __ __ __ __ __

    Apparently, FEL tries to read data one byte at a time and this does
    not always work correctly. Introducing new commands to explicitly
    do 32-bit reads and writes helps:

      $ sunxi-fel readl 0x01c23800
      0x16254187
Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>
Tested-by: Bernhard Nortmann <bernhard.nortmann@web.de>