temporary mock_clean_cache_config files left after building

[Al Bailey]

Brief Description
-----------------
This bug is a minor cleanup 'nit'

When building rpms using the build tools the following types of temp files are left behind
/tmp/mock_clean_cache_cfg_ZY1L3M

It turns out this is becaase the cleanup code in the build tools has a small typo
Its using 'TPM' instead of 'TMP'
https://github.com/starlingx/root/blob/master/build-tools/build-rpms-serial#L934
and
https://github.com/starlingx/root/blob/master/build-tools/build-rpms-parallel#L1153

This is a low priority bug, It does not have to be addressed, its just a small cleanup activity.

Severity
--------
Minor

Steps to Reproduce
------------------
build-rpms

Expected Behavior
------------------
It should not leave behind /tmp/mock_clean_cache_cfg_<blah> files

Actual Behavior
----------------
It leaves behind one of its temp files

Reproducibility
---------------
100%

System Configuration
--------------------
N/A

Branch/Pull Time/Commit
-----------------------
N/A

Last Pass
---------
N/A

Timestamp/Logs
--------------
N/A

Test Activity
-------------
Developer Testing

Workaround
----------
No workaround required. /tmp would get cleaned up on reboot and the files are tiny.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/starlingx/root/+/859477

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/starlingx/root/+/859477
Committed: https://opendev.org/starlingx/root/commit/9afc2a9b162817520a8d7cea69f23d4d1524cc91
Submitter: "Zuul (22348)"
Branch: master

commit 9afc2a9b162817520a8d7cea69f23d4d1524cc91
Author: Davlet Panech <email address hidden>
Date: Tue Sep 27 16:09:31 2022 -0400

    build-rpms: fix typo in temp files removal

    Closes-Bug: 1991009

    Signed-off-by: Davlet Panech <email address hidden>
    Change-Id: I8b0dfc5d58f30f83e305e450de14c5eb4375d4de