Remove blocked branches
Remove blocked branches

"coverity_scan" branch is been removed as Travis shouldn't be
blocked from triggering it to run Coverity on it.

"development-psa" branch isn't used anymore and also it used to
depend on a private submodule which Travis would fail to get.

Mbed-TLS/mbedtls,Mbed-TLS/mbedtls,ARMmbed/mbedtls,ARMmbed/mbedtls,NXPmicro/mbedtls,NXPmicro/mbedtls,Mbed-TLS/mbedtls,Mbed-TLS/mbedtls,NXPmicro/mbedtls,ARMmbed/mbedtls,NXPmicro/mbedtls,ARMmbed/mbedtls