clk: tegra: Fix sparse warning for pll_m

Sparse generates the following warning for the pll_m params structure:

drivers/clk/tegra/clk-tegra210.c:1569:10: warning: Initializer entry
 defined twice
drivers/clk/tegra/clk-tegra210.c:1570:10:   also defined here

Fix this by correcting the index for the MISC1 register.

Fixes: b31eba5ff3f7 ("clk: tegra: Add support for Tegra210 clocks")

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Acked-by: Rhyland Klein <rklein@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>