msm: ipa: fix uC descriptor ring IPA SRAM area

uC descriptor IPA SRAM area used for uC descriptors
and its name need to be uc descriptor ram.

CRs-Fixed: 2314865
Change-Id: Id7279322c6f428e253c58b441e12615b5ffaf23f
Signed-off-by: Ghanim Fodi <gfodi@codeaurora.org>