ARM: dts: msm: Vote for oxili_timer_clk for msm8939 and msm8929

The oxili_timer_clk needs to be enabled to take advantage of
the RBBM_ALWAYSON_COUNTER. Add this clk to the list of gpu
clks being enabled for msm8939 and 8929.

CRs-Fixed: 786484
Change-Id: I362a4bf331f0b07f7a0edee9d566e9c1bd2096d1
Signed-off-by: Ananta Kishore K <akollipa@codeaurora.org>
Signed-off-by: Gaurav Gagrani <ggagrani@codeaurora.org>