Input: cap11xx - guard unsupported DT properties before parsing

Check of_property_present() before parsing microchip,calib-sensitivity
and microchip,signal-guard, so that models which do not support these
properties (e.g. CAP1114) skip the parsing entirely.

This prevents a potential buffer overflow in calib_sensitivities[8] and
signal_guard_inputs_mask when a model with more than 8 channels
(CAP1114 has 14) would otherwise call of_property_read_u32_array()
with num_channels as the element count.

Signed-off-by: Jun Yan <jerrysteve1101@gmail.com>
Link: https://patch.msgid.link/20260617150318.753148-9-jerrysteve1101@gmail.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

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