clk: berlin: bg2: remove CLK_IGNORE_UNUSED flag for sdio clk

The clocks' properties have been already properly set, so there's no
need to set this flag for sdio0 and sdio1 clk any more.

Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
Signed-off-by: Michael Turquette <mturquette@baylibre.com>