Add an exclude list for known failing Hifive1 tests (#485)

* Add an exclude list for known failing Hifive1 tests

This commit adds a list of known failing tests based on: https://github.com/riscv/riscv-openocd/issues/869#issue-1769176709



* Fix name of the HiFive1 flash target 

Signed-off-by: Marek Vrbka <133884222+MarekVCodasip@users.noreply.github.com>

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Signed-off-by: Marek Vrbka <133884222+MarekVCodasip@users.noreply.github.com>