Add LPC1769 template file for MCUXpresso IDE

[yennster]

Description

A simple PR that adds an export template file for the LPC1769. Tested on MCUXpresso IDE and the LPC1769 board is correctly identified by the IDE and mbed-os-example-blinky builds successfully.

I also fixed some typos in the MCUXpresso exporter __init__.py script.

Pull request type

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

[0xc0170]

/morph build

[mbed-ci]

Build : FAILURE

Build number : 3151
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/7916/

[0xc0170]

The error looks CI related (cleanup did not do its job), will restart later

[NirSonnenschein]

/morph build

[mbed-ci]

Build : SUCCESS

Build number : 3224
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/7916/

Triggering tests

/morph test
/morph mbed2-build

[mbed-ci]

Test : FAILURE

Build number : 3027
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/7916/3027

[yennster]

@0xc0170 These new failures look CI related as well

[0xc0170]

/morph test

[mbed-ci]

Test : SUCCESS

Build number : 3045
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/7916/3045

[0xc0170]

/morph export-build

[mbed-ci]

Exporter Build : FAILURE

Build number : 2836
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/exporter/7916/

[0xc0170]

/morph export-build

[mbed-ci]

Exporter Build : SUCCESS

Build number : 2844
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/exporter/7916/