clk: qcom: gcc: Add GPLL6 fixed factor support for qm215

Due to some race between gpll6_out_main and out_aux
clocks pll enable bit was getting cleared. This makes
gpll6_out_main as fixed factor clock so, that enable_bit
is set and reset only from out_aux clock for qm215 target.

Change-Id: I2a26581af648a36babb149972c1d81f85310a720
Signed-off-by: Chetan C R <cchinnad@codeaurora.org>