Fix WIFI-GET-RSSI test case failure and remove extra label from CYW9P62S1_43438EVB_01 in target.json

[miteshdedhia7]

Summary of changes

Minor fixes

• Remove an assert from get_rssi() in WhdSTAInterface.cpp which causes rssi greentea test to fail in Cypress parts. This is because the RSSI GT test expect the negative test case to return 0 and not assert.
• Remove extraneous label from CYW9P62S1_43438EVB_01 target to include CM0p firmware image that has been updated to be included using the component mechanism.

Impact of changes

None

Migration actions required

None

Documentation

None

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Pull request type

[x] Patch update (Bug fix / Target update / Docs update / Test update / Refactor)
[] Feature update (New feature / Functionality change / New API)
[] Major update (Breaking change E.g. Return code change / API behaviour change)

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Test results

Regular Greentea Results:
GT_FT_KIT_062S2_43012_GCC.txt
GT_FT_P6S1_43012EVB_01_GCC.txt
GT_FT_PROTO_062_4343W_GCC.txt
GT_FT_PROTO_062S3_4343W.txt
GT_FT_PROTO_063_BLE_GCC.txt
GT_FT_KIT_062_WIFI_BT_GCC.txt
GT_FT_KIT_062_BLE_GCC.txt

Network/Netsocket Test Results:
GT_FT_P6S1_43012EVB_01_GCC_NET.txt
GT_FT_PROTO_062S3_4343W_GCC_NET.txt
GT-FT-KIT_062_WIFI_BT-GCC-NET.txt
GT-FT-KIT-062S2-43012-GCC-NET.txt
GT-FT-PROT-062-4343W-GCC-NET.txt
GT_FT_KIT_EVB_43012_GCC-NET.txt

Test failures and explanations:

• All sleep failures are expected due to to a known incompatibility between the sleep tests and our UART driver.
• The failures with the features-storage-tests-filesystem-general_filesystem and tests-integration-stress-net-fs(only fails on CY8CPROTO_062S3_4343W board) are newly introduced on master and are being actively worked-on to fix. These are unrelated to the changes in this PR.

[] No Tests required for this change (E.g docs only update)
[x] Covered by existing mbed-os tests (Greentea or Unittest)
[] Tests / results supplied as part of this PR

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Reviewers

@morser499 @maclobdell

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[ciarmcom]

@miteshdedhia7, thank you for your changes.
@morser499 @maclobdell @ARMmbed/mbed-os-maintainers @ARMmbed/mbed-os-ipcore please review.

[0xc0170]

Restarted travis to report status back, will schedule CI once we complete 5.15 Prs

[0xc0170]

Travis did not report, I'll reopen this one in a minute

[0xc0170]

CI started

[mbed-ci]

Test run: SUCCESS

Summary: 6 of 6 test jobs passed
Build number : 1
Build artifacts