ARM: dts: msm: Add support for 384 MHz DDR frequency in 8084

Since the RPM rounds up any frequency requests, this change would be
backward compatible with devices that support 393 MHz instead of 384 MHz.

CRs-Fixed: 671411
Change-Id: I8d8041de7f6452c1b53e054d7a58a5a297055c03
Signed-off-by: Saravana Kannan <skannan@codeaurora.org>