MIMXRT1050_EVK: IAR nightly exporters failing

[0xc0170]

Description

PR adding this target #9496

The logs:

WTD: Unavailable option selection: 'NXP MIMXRT1052xxx6B'.
WTD: Changed to default selection: 'None'.

This leads to build errors.
Our CI IAR build version: IAR Command Line Build Utility V7.5.6.4719, it's IAR 7.8.x

cc @ARMmbed/team-nxp

Issue request type

[ ] Question
[ ] Enhancement
[X] Bug

[ciarmcom]

Internal Jira reference: https://jira.arm.com/browse/MBOCUSTRIA-833

[0xc0170]

This confirms our CI results: http://supp.iar.com/FilesPublic/UPDINFO/012876/arm/doc/infocenter/readme.ENU.html

This target was added to IAR 8.22 version

I'll revert offending commit today

[0xc0170]

Revert here #9657