arm: mach-k3: am62ax: fix MCU_CLKOUT0 parent clock mux

arm: mach-k3: am62ax: fix MCU_CLKOUT0 parent clock mux

Much like what was fixed on the AM62x and AM62Px platforms[0]. The
CU_CLKOUT0 has two (25mhz and 50mhz) mux options however the clock
structure incorrectly duplicated the first 50mhz option twice. Fix this
for the AM62A platforms so the 25mhz option is selectable.

[0] https://lore.kernel.org/all/20250408161211.3165588-1-parth105105@gmail.com/

Reported-by: Parth Pancholi <parth.pancholi@toradex.com>
Signed-off-by: Bryan Brattlof <bb@ti.com>