msm: ipa: Update IPA_SRAM_DIRECT_ACCESS_n for IPA4.5

IPA shared RAM S/W area access can be done via this
register. At IPA4.5 the register name and offset
changed. This change updates the code accordingly.

CRs-Fixed: 2291194
Change-Id: Ibd683181f551df63097a58fd1e0473a3564236b6
Signed-off-by: Ghanim Fodi <gfodi@codeaurora.org>