[conn] Update spi_host clk
[conn] Update spi_host clk

With PR #8709, the clk_core_i is removed from SPI_HOST.
So update the connectivity test to reflect the change.

Signed-off-by: Cindy Chen <399ad771a111eac8923348b1e2af093034e5d4f1@opentitan.org>

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