arm64: dts: qcom: sdm845-db845c: Specify a i2c bus clocks

The kernel log contains complaints about i2c11 and i2c14 lacking
clock-frequency, specify a reasonable value to suppress this warning.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: Vinod Koul <vkoul@kernel.org>
Link: https://lore.kernel.org/r/20220717034403.2135027-4-bjorn.andersson@linaro.org