ARM: dts: msm: enable MHI chan MHIP_0 for tethering for kona-sdxprairie

MHIP_0 channel is used for tethering data between external modem
and host. Updating device tree for kona-sdxprairie.

CRs-Fixed: 2422989
Change-Id: I14f2f6a47f1a8c18b4b0caeda2dd2d780ad7333d
Signed-off-by: Sujeev Dias <sdias@codeaurora.org>