clk: qcom: clk-alpha-pll: fix CAL_L write in alpha_pll_fabia_prepare

clk: qcom: clk-alpha-pll: fix CAL_L write in alpha_pll_fabia_prepare

Caught this when looking at alpha-pll code. Untested but it is clear that
this was intended to write to PLL_CAL_L_VAL and not PLL_ALPHA_VAL.

Fixes: a34b17ed425c ("clk: qcom: clk-alpha-pll: Add support for Fabia PLL calibration")
Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Link: https://lore.kernel.org/r/20210609022852.4151-1-jonathan@marek.ca
Signed-off-by: Stephen Boyd <sboyd@kernel.org>