clk: sandbox: update driver for CONFIG_CLK_AUTO_ID support

clk: sandbox: update driver for CONFIG_CLK_AUTO_ID support

Update the sandbox driver to allow support of the
CONFIG_CLK_AUTO_ID by using the new API clk_get_id()
to get the internal SANDBOX identifier.

With CONFIG_CLK_AUTO_ID, clk->id have the also seq identifier.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Cc: Lukasz Majewski <lukma@denx.de>
Cc: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>