fix(PeriphDrivers): Explicitly set the LPCMP Polarity Setting (Rising/Falling)

[sihyung-maxim]

Description

The MXC_LPCMP_POL_RISE and MXC_LPCMP_POL_FALL enumeration values are used to set the polarity setting for the LPCMP. However, they weren't explicitly set with the values 0 and 1, respectively, which can cause the H->L transition setting to be selected when using the MXC_LPCMP_POL_RISE enum value (should be MXC_LPCMP_POL_FALL that selects the H->L transition setting) and vice versa.

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