x86/CPU/AMD: Replace strcpy() with strscpy()

strcpy() is deprecated due to issues with bounds checking and overflows.
Replace it with strscpy().

Signed-off-by: Ruben Wauters <rubenru09@aol.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/20250429230710.54014-1-rubenru09@aol.com