ARM: dts: msm: Mount the vendor partition during early init

Add support to early mount vendor partition so that vendor modules
can be loaded during early init for msm8917, msm8937, msm8953
and msm8996.

CRs-Fixed: 2055039
Change-Id: If9c7d4b1f7d0e5ae811890b59ec0d9fba20f2f15
Signed-off-by: Swetha Chikkaboraiah <schikk@codeaurora.org>
Signed-off-by: Nirmal Abraham <nabrah@codeaurora.org>