Built-in Kernel command Line

Using buildroot 90a82116,

I do make linux-xconfig (Linux5.10.7) and then in the boot options I change the built-in kernel command line to include the following string:
"console=hvc0 earlycon=sbi loglevel=3"
Hoping that by default, (I mean when no boot argument is provided), the kernel would boot in quiet mode.
However, the resulting kernel boots in verbose mode and prints all the normal boot messages. When setting the boot argument to "quiet" the kernel then boots in quiet mode. Is there a way to get the "quiet" mode built into the Kernel?
G

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