clk: qcom: gcc: Add support for a new frequency for SC7180

There is a requirement to support 51.2MHz from GPLL6 for qup clocks,
thus update the frequency table and parent data/map to use the GPLL6
source PLL.

Fixes: 17269568 ("clk: qcom: Add Global Clock controller (GCC) driver for SC7180")
Signed-off-by: Taniya Das <tdas@codeaurora.org>
Link: https://lkml.kernel.org/r/1589709861-27580-2-git-send-email-tdas@codeaurora.org


Signed-off-by: Stephen Boyd <sboyd@kernel.org>