ipa: rkisp1: Initialize FrameContext.agc.meteringMode

The RkISP1 AGC algorithms assumes the metering mode to be
"MeteringMatrix" and pre-fill an array of weights associated
with it stored in meteringModes_[MeteringMatrix] when intializing
the algorithm in parseMeteringModes().

It laters fetches the weights when computing parameters using the
FrameContext.agc.meteringMode as index of the meteringModes_ array.

When a Request gets queued to the algorithm, the
FrameContext.agc.meteringMode index is populated from the algorithm's
active state, and optionally updated if the application has specified
a different metering mode.

In case of Request underrun however, a non-initialized FrameContext
gets provided to the algorithm, causing an (unhandled) exception when
accessing the meteringModes_ array.

Fix this by intializing the AGC metering mode to a supported value
coming from the ActiveState in IPAFrameContext::init().

Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>

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