Fix for pinmap & usticker free() in TMPM3H6

[ghost]

Description

Fix pinmap data overwriting to same port pins
Implemented usticker free()

Greentea test for IAR toolchain is attached.
M3H6_IAR_Greentea_Test_Results.txt

Pull request type

[x] Fix
[ ] Refactor
[ ] Target update
[ ] Functionality change
[ ] Breaking change

[studavekar]

/morph build

[mbed-ci]

Build : FAILURE

Build number : 3265
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/8325/

[NirSonnenschein]

build failed due to license server issue, re-running
/morph build

[mbed-ci]

Build : SUCCESS

Build number : 3272
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/8325/

Triggering tests

/morph test
/morph export-build
/morph mbed2-build

[mbed-ci]

Exporter Build : SUCCESS

Build number : 2894
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/exporter/8325/

[mbed-ci]

Test : SUCCESS

Build number : 3080
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/8325/3080