msm: clock-8x60: Fix clock mapping for mmfpb_a_clk

Clock names changes to the tables removed any clock with
connection name mmfpb_a_clk. Add an entry so that we can use
clk_get_sys() to get the clock in the clock driver.

Change-Id: Ie6cdaee9e68833eaf8db86785143ed856f179d27
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>