ARM: dts: msm: change ufshc_mem to ufshc for sdm845

UFS host controller interfacing to embedded UFS card was always named as
"ufshc" for previous chipsets but now that we have 2 instances of UFS
host controller on sdm845, we had changed the name to "ufshc_mem" but
this is breaking the common userspace code shared between previous
chipsets and sdm845. So rename "ufshc_mem" back to "ufshc".

Change-Id: I6b58008bd08e48f379fe37e48821579e880fd40d
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>