Platform drivers for Mbed.

Dependents:   EVAL-CN0535-FMCZ EVAL-CN0535-FMCZ EVAL-AD568x-AD569x EVAL-AD7606 ... more

Updates with PWM,IRQ and Delay Module and Addition of Timer Module

The following changes were made: 1.) Modified udelay() function for generating more accurate smaller usec delays 2.) Implemented the irq_enable and irq_disable functions 3.) Removed the confusion b/w application created peripheral object and interrupt specific object 4.) Created PWM extra init structure and added PWM pin as it's member for multiplatform project compatibility 5.) Added a module for timer and its related header file

Forked repo of Platform Drivers- Analog Devices