clk: mmp2: Add HSIC clocks

There are two USB HSIC controllers on MMP2 and MMP3.

Link: https://lore.kernel.org/r/20191220065314.237624-3-lkundrak@v3.sk


Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Acked-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Olof Johansson <olof@lixom.net>