Added Timer2 Option for uart baud rate

Signed-off-by: Sriharsha <helpzuna@gmail.com>
Small modifications

Signed-off-by: Sriharsha <helpzuna@gmail.com>
Added I2C Scan option

Signed-off-by: Sriharsha <helpzuna@gmail.com>
Keypad driver coding started

Signed-off-by: Sriharsha <helpzuna@gmail.com>
ADC0804 Driver added (Not tested)

Signed-off-by: Sriharsha <helpzuna@gmail.com>