I2C SW modifications

[KinzaQamar]

All the refactoring / restructuring required to extend the existent functionality. For example,

• Currently SW supports a single byte reads and writes. Extent it to do multiple bytes reads and write
• I2C timing for SCL high cyles needs to satisfy some constrains
• Increment rise cycles by one if CDC instrumentation if on.

[KinzaQamar]

Create #565:

• to aid correct SCL high cycles calculation
• to support all timing parameter calculations for all supported speeds by I2C block