Resolve "Double precision arithmetic in Reverberator"

• Related issues: #814 (closed)
• Requested reviewers: @szczerba @vaclav

Reason why this change is needed

• There are used double precision mathematical functions ceil(), round() and floor() in Reverberation. Consider to use a single precision counterpart ceilf(), roundf() and floorf()

Description of the change

• Functions are replaced with single precision counterparts.

Affected operating points

• BE

Related to #814 (closed)