[v2] media: rc: fix Meson IR decoder

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The meson-ir driver uses the wrong offset (at least according to
Amlogic's reference driver as well as the datasheets of the
Meson8b/S805 and GXBB/S905).
This means that we are getting incorrect durations (REG1_TIME_IV)
reported from the hardware.

This problem was also noticed by some people trying to use this on an
ODROID-C1 and ODROID-C2 - the workaround there (probably because the
datasheets were not publicy available yet at that time) was to switch
to ir_raw_event_store_edge (which leaves it up to the kernel to measure
the duration of a pulse). See [0] and [1] for the corresponding
patches.

Please note that I was only able to test this on an GXBB/S905 based
device (due to lack of other hardware).


[0] https://github.com/erdoukki/linux-amlogic-1/commit/969b2e2242fb14a13cb651f9a1cf771b599c958b
[1] http://forum.odroid.com/viewtopic.php?f=135&t=20504

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