ata: sata_gemini: Remove remaining reset glue

Now that gemini_sata_reset_bridge() is gone, we can remove
the sata0/1_reset members and the code that creates them.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>