I2C: allow configuring pin filters

[bugadani]

cc #2493

[bjoernQ]

I guess the issue refers to this from the TRM

28.4.2 SCL and SDA Noise Filtering

SCL_Filter and SDA_Filter modules are identical and are used to filter signal noise on SCL and SDA,
respectively. These filters can be enabled or disabled by configuring I2C_SCL_FILTER_EN and
I2C_SDA_FILTER_EN.

Take SCL_Filter as an example. When enabled, SCL_Filter samples input signals on the SCL line continuously.
These input signals are valid only if they remain unchanged for consecutive I2C_SCL_FILTER_THRES
I2C_SCLK clock cycles. Given that only valid input signals can pass through the filter, SCL_Filter can remove
glitches whose pulse width is shorter than I2C_SCL_FILTER_THRES I2C_SCLK clock cycles, while SDA_Filter
can remove glitches whose pulse width is shorter than I2C_SDA_FILTER_THRES I2C_SCLK clock
cycles.

Sounds like it's just something we can add to Config