clk: qcom: clk-alpha: Reconfigure Fabia PLL during enable

During enable read the L value to determine if the configuration
is required again, otherwise the PLL would fail to lock or enable
due to lost/missing values.

Change-Id: I062540185025e1357539c8b2f28a023ea4e050d4
Signed-off-by: Diptanshu Jamgade <djamgade@codeaurora.org>