drivers: base: Print a warning instead of panic() when register_cpu() fails

loongarch, mips, parisc, riscv and sh all print a warning if
register_cpu() returns an error. Architectures that use
GENERIC_CPU_DEVICES call panic() instead.

Errors in this path indicate something is wrong with the firmware
description of the platform, but the kernel is able to keep running.

Downgrade this to a warning to make it easier to debug this issue.

This will allow architectures that switching over to GENERIC_CPU_DEVICES
to drop their warning, but keep the existing behaviour.

Signed-off-by: James Morse <[email protected]>
Reviewed-by: "Russell King (Oracle)" <[email protected]>
Reviewed-by: Shaoqin Huang <[email protected]>
Signed-off-by: "Russell King (Oracle)" <[email protected]>
Reviewed-by: Gavin Shan <[email protected]>
Reviewed-by: Jonathan Cameron <[email protected]>
Reviewed-by: Thomas Gleixner <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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