arch: arm: mach-k3: j784s4_init: Set CTRL_MMR for AUDIO_REFCLK1 clk_sel

arch: arm: mach-k3: j784s4_init: Set CTRL_MMR for AUDIO_REFCLK1 clk_sel

The default value for the mux to select the parent clock,
AUDIO_REFCLK1_CTRL_CLK_SEL is '11111' (31) but the mux input for 31
is marked as 'Reserved' so the ti-sci-clk call for get-parent fails.
Mark it to a valid value, '11100' (28) for MAIN_PLL4_HSDIV2_CLKOUT
to get rid of the linux failures during boot-time like:
"[    1.573193] ti-sci-clk 44083000.system-controller:clock-controller:
 get-parent failed for dev=157, clk=34, ret=-19"

Signed-off-by: Jayesh Choudhary <j-choudhary@ti.com>