clk: qcom: gcc: Update clock flags for reference clk

Updating clock flags for gcc_usb3_prim_clkref_clk and
gcc_pcie_0_clkref_clk to BRANCH_HALT_DELAY as there are
no CLK_OFF bit corresponding to these reference clocks.

Change-Id: I91a9771cd4812cb2e679bf117437303eaffa1c09
Signed-off-by: Naveen Yadav <naveenky@codeaurora.org>