x86/fpu: Mark init functions __init

commit 1703db2b90c91b2eb2d699519fc505fe431dde0e upstream

No point in keeping them around.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20230613224545.841685728@linutronix.de


Signed-off-by: Daniel Sneddon <daniel.sneddon@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>