clk: qcom: clock-pll: Panic if a variable rate PLL fails to lock

Occasionally, variable rate PLLs may fail to achieve a lock, and the
output frequency may not match what software expects after configuring
an L value for a certain frequency. If the PLL fails to lock, that is,
the lock detection bit does not go high even after waiting for the
mandated amount of time, record additional PLL debug information in the
kernel log and then panic.

Change-Id: Ib913d7620ef9d1fc94a1c353e528f558c3117d81
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>
Signed-off-by: Pushkar Joshi <pushkarj@codeaurora.org>