ARM: dts: msm: Update early mount of vendor partition for SDM855

Update the early mount of vendor partition details from ufs to
sdhc for sdm855, because boot device changed from UFS to sdcard.

Change-Id: I2e3a7329297f79e7b039f4ab8234a4c126cc5890
Signed-off-by: Chalapathi Bathala <chalapathi@codeaurora.org>
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>