arm64: dts: qcom: msm8994: Provide missing "xo_board" and "sleep_clk" to GCC

This is needed due changes in commit 0519d1d0 ("clk: qcom:
gcc-msm8994: Modernize the driver"), which removed struct
clk_fixed_factor. Preparation for next commit for enabling SD/eMMC.
Inspired by 2c2f64ae.

This is required for both msm8994-huawei-angler (sdhc1 will be enabled
in next commit) and msm8992-lg-bullhead (where actually fixes sdhc1
- tested on bullhead rev 1.01).

Fixes: 0519d1d0 ("clk: qcom: gcc-msm8994: Modernize the driver")

Signed-off-by: Petr Vorel <petr.vorel@gmail.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220113233358.17972-4-petr.vorel@gmail.com