clk: qcom: gcc-sdxpoorwills: remove gcc_mss_snoc_axi_clk

Remove gcc_mss_snoc_axi_clk because it's initialized in TZ and
doesn't need to be managed by Linux anymore.

Change-Id: Ib88772222fdfc90a4cc86aa74d97a5d92aa9c71e
Signed-off-by: Willie Ruan <wruan@codeaurora.org>