clk: qcom: Kconfig: Add support to select GDSC flag for SM6150

Select GDSC flag whenever we select flag for global clock
controlller for SM6150 so that all the gdsc also get registered
along with GCC.

Change-Id: I8be9e55bc048fbac07544df3d84b43232fe165b3
Signed-off-by: Amit Nischal <anischal@codeaurora.org>