configs: am65x_evm_a53: disable CONSOLE_MUX

We do not have a need to share a single console with the evaluation
board and disabling this option reduces the complexity of configuring
the consoles. Disable CONSOLE_MUX

Tested-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Bryan Brattlof <bb@ti.com>
Reviewed-by: Nishanth Menon <nm@ti.com>
diff --git a/configs/am65x_evm_a53_defconfig b/configs/am65x_evm_a53_defconfig
index f436986..4d95e3b 100644
--- a/configs/am65x_evm_a53_defconfig
+++ b/configs/am65x_evm_a53_defconfig
@@ -36,7 +36,6 @@
 CONFIG_OF_SYSTEM_SETUP=y
 CONFIG_BOOTCOMMAND="run findfdt; run distro_bootcmd; run init_${boot}; run boot_rprocs; if test ${boot_fit} -eq 1; then run get_fit_${boot}; run get_overlaystring; run run_fit; else; run get_kern_${boot}; run get_fdt_${boot}; run get_overlay_${boot}; run run_kern; fi;"
 CONFIG_LOGLEVEL=7
-CONFIG_CONSOLE_MUX=y
 CONFIG_SPL_MAX_SIZE=0x58000
 CONFIG_SPL_HAS_BSS_LINKER_SECTION=y
 CONFIG_SPL_BSS_START_ADDR=0x80a00000